The manganese content of the original sample is approximately 5.09%.
To determine the manganese content of the original sample, we need to know the atomic weight of manganese and the molecular weights of manganese(III) nitrate and manganese(III) sulfide.
Manganese has an atomic weight of 54.94 g/mol.
Manganese (III) nitrate has a molecular weight of 158.03 g/mol Manganese (III) sulfide has a molecular weight of 160.13 g/mol
The first step is to calculate the weight of manganese in manganese(III) nitrate.
0.2876 g manganese (III) sulfide ÷ 160.13 g/mol manganese (III) sulfide = 0.0018 g manganese
The manganese weight of the original sample can then be determined from the manganese weight of manganese(III) sulfide.
0.0018 g manganese ÷ 0.2876 g manganese (III) sulfide = 0.0626 g manganese per 1.2354 g sample
Finally, the weight of manganese in the sample can be used to calculate the percentage of manganese in the sample.
(0.0626 g manganese ÷ 1.2354 g sample) × 100% = 5.09% manganese
Therefore, the manganese content of the original sample is approximately 5.09%.
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Use electron-dot notation to demonstrate the formation of ionic compounds involving the following: a. Li and Cl. b. Ca and I
Answer:
tangol is Ca Li -56-(99)
how much carbon dioxide have we emitted into the atmosphere by burning fossil fuels since the industrial revolution? group of answer choices a million tons half a trillion tons half a billion tons a billion tons
The Answer is d. half a trillion tons
What is fossil fuels?
Fossil fuel is a term for non-renewable energy sources such as coal, crude oil, coal products, derived gas, natural gas, petroleum products and non-renewable wastes. These fuels originate from plants and animals that existed in the geological past (millions of years ago).
When fossil fuels are burned, they release large amounts of carbon dioxide, a greenhouse gas, into the atmosphere. Greenhouse gases trap heat in the atmosphere, causing global warming.
I suppose the question is :
How much carbon dioxide have we emitted into the atmosphere by burning fossil fuels since the industrial revolution?
a- a million tons
b- a billion tons
c- half a billion tons
d- half a trillion tons
e- a trillion tons
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Halogen lamp bulbs are usually filled with bromine or iodine vapour at 5.0 atm pressure then sealed while at room temperature. When turned on, the glass bulb heats up to 1150°C. If room temperature is 20.0 °C, determine the pressure in the bulb when it reaches its operating temperature.
According to ideal gas equation and assuming number of moles as 1 and volume as 6.35×10[tex]^-6[/tex] liters the pressure in the bulb is 1.837×10[tex]^-3[/tex] atmospheres.
What is ideal gas equation?The ideal gas equation is a equation which is applicable in a hypothetical state of an ideal gas.It is a combination of Boyle's law, Charle's law,Avogadro's law and Gay-Lussac's law . It is given as, PV=nRT where R= gas constant whose value is 8.314.The law has several limitations.
Substituting n=1 ,V=6.35×10[tex]^-6[/tex] L,R=8.314,ΔT=1130°C=1403.15 K in the above equation P=1×8.314×1403.15/6.35×10[tex]^-6[/tex] =1.837×10[tex]^-3[/tex] atmospheres.
Thus, the pressure in the bulb when it reaches its operating temperature is 1.837×10[tex]^-3[/tex] atmospheres.
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Most of the energy released in citric acid cycle reactions is conserved in ________.
Most of the energy released in citric acid cycle reactions is conserved in NADH.
What is NADH?
Nicotinamide adenine dinucleotide is a central coenzyme of metabolism. NAD is found in all living cells and is called a dinucleotide because it consists of two nucleotides joined by a phosphate group. One nucleotide contains one adenine nucleobase and one nicotinamide.
NADH stands for "Nicotinamide Adenine Dinucleotide (NAD) + Hydrogen (H)", which occurs naturally in the body and is involved in energy production. NADH produced by the body is involved in the production of energy in the body. Taking NADH supplements can affect blood pressure and have other effects.
Therefore, Most of the energy released in citric acid cycle reactions is conserved in NADH.
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My topic is cell phone radiation’s for my stem fair project, what should be my question and hypothesis?
Here are some potential questions and hypotheses for a stem fair project on cell phone radiation:
Question: Does the distance between a cell phone and a person's head affect the level of radiation exposure?
Hypothesis: If a cell phone is held closer to a person's head, then the level of radiation exposure will be higher.
Question: Do different types of cell phone cases affect the level of radiation exposure?
Hypothesis: If a cell phone is covered by a case made of a certain material, then the level of radiation exposure will be lower.
Question: How does the amount of time a person spends on their cell phone affect their level of radiation exposure?
Hypothesis: If a person spends more time on their cell phone, then their level of radiation exposure will be higher.
It's important to note that these are just a few potential ideas, and you may want to come up with your own question and hypothesis based on your interests and the resources available to you. It's also important to conduct thorough research and use reliable sources to support your conclusions.
How many grams are contained in 0.27 moles of calcium?
Answer:
[tex]40.08 \: grams[/tex]
Explanation:
Therefore, 0.27 moles of calcium to grams is the game as 0.27 moles of Ca to grams, 0.27 moles of calcium to g, and 0.27 moles of Ca to g. Furthermore, the atomic mass of calcium is 40.08. That means that one mole of calcium weighs 40.08 grams (40.08 g/mol).
what sort of plot would you have obtained if fractional distillation had given you a complete separation of component
Firstly till 5mL temperature remains constant then suddenly rise in temperature and then again constant.
What is fractional distillation?
Fractional distillation is a type of distillation process that separates a mixture of liquids into its individual components (or fractions) based on their boiling points. This process is commonly used in the petrochemical and oil refining industries to separate large volumes of crude oil into more useful fractions. The process takes advantage of the differences in boiling points of the various components of the mixture, which can vary widely. The process begins by heating the mixture to a temperature where at least one of the components will vaporize. The vapor is then collected and condensed back into the liquid phase. This process is repeated until all of the desired components are collected. This method of separation is extremely efficient and cost-effective compared to other methods, such as liquid-liquid extraction or chromatography.
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Calculate the number of moles of MnO4- in 20. 1 mL of 0. 020 M potassium permanganate solution.
Calculate the number of moles of hydrogen peroxide needed to react with 20. 5 mL of 0. 020 M potassium permanganate solution
The number of moles of hydrogen peroxide is 0.402 moles
Calculation:
Water volume, V = 20.1 mL.
MnO4 has a molarity of 0.020 M.
To Locate:the quantity of potassium permanganate solution in moles.
Solution:
Molarity is determined by:
M = Volume in liters/Numbers of moles
0.020=n/20.1
n=0.020×20.1
n=0.402moles
As a result, 0.402 moles of potassium permanganate solution are present.
How many moles are there in chemistry?6.02214076 x 1023 of any chemical unit, such as atom, molecules, ions, and others, constitute a mole. Due to the large number of atoms, molecules, or other components that make up any substance, the mole is a useful measure to utilize.
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how do the reported and calculated values of ka and pka for acetic acid compare? explain any possible experimental errors.
Although the pKa constant is 4.8 and is a more straightforward expression, the Ka constant for acetic acid (CH3COOH) is 0.0000158 (= 10-4.8). Additionally, the strength of the acid increases with decreasing pKa values.
For instance, lactic acid has a pKa value of roughly 3.8, which indicates that it is a stronger acid than acetic acid.
Acetic acid, officially known as ethanoic acid, is an organic substance with the chemical formula CH3COOH that is acidic, colorless, and liquid (also written as CH3CO2H, C2H4O2, or HC2H3O2). Apart from water and other trace ingredients, vinegar has at least 4% acetic acid by volume, making acetic acid its primary ingredient.
The second-simplest carboxylic acid is acetic acid (after formic acid). It serves as a significant industrial chemical and reagent in the manufacture of cellulose acetate.
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What are the values of δs for the water, the surroundings, and the universe for the evaporation of water from an open pan at 25°c?.
The values of entropy δs for the water, the surroundings, and the universe for the evaporation of water are positive, negative, positive.
What is entropy?
Entropy is a term used to describe the increase in disorganization inside a system or the assessment of the degree of unpredictability. It is denoted by δs.
Gases have a higher entropy than liquids, which in turn has a higher entropy than solids. The entropy of water increases when it transforms from a liquid to a gas.
So, δs of water is positive.
The environment's entropy must decrease in order to provide the system with the thermal energy it needs.
So, δs of surroundings is negative.
The Second Law of Thermodynamics states that if a process is spontaneous i.e. water evaporation in universe.
So, δs of evaporation from open pan is positive.
The values of δs for the water, the surroundings, and the universe for the evaporation of water are positive, negative, positive.
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Which equipment is used to stop fires in a laboratory? extinguisher bunsen burner first aid kit eye wash.
Fire extinguisher is used to stop fires in a laboratory.
Chemical splashes on to your face then we should go to eye wash station for washing face.
Bunsen burner is knocked over while lit and a large fire is started then we should use fire extinguisher and should come out of lab.
Carbon dioxide in fire extinguisher is more denser than oxygen so when we spray carbon dioxide on fire, it cut off the contact with oxygen and fire goes off.
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during the 4th of july celebration, a little kid asks you how they make fireworks different colors
Answer:
Mineral elements provide the color in fireworks. Barium produces bright greens; strontium yields deep reds; copper produces blues; and sodium yields yellow.
Explanation:
I hope my answer helped you! If you need more information or help, comment down below and I will be sure to respond if I am online. Have a wonderful rest of your day!
Calculate the number of molecules in 9.04 moles of Barium hydroxide,
Ba(OH)2.
Answer: 5.44 x 10^24
Explanation:
Converting between molecules and moles is done by either multiplying by or dividing by Avogadro's number:
1-To go from moles to molecules, multiply the number of moles
by 6.022 x 10^23.
2-To go from molecules to moles, divide the numbers of molecules
by 6.022 x 10^23.
Given number of moles (9.04) We can compensate directly using the formula (Moles equal number of atoms/molecules over Avogadro's number)
Number of molecules = 9.04 x 6.022 x 10^23= 54.43888 x 10^23
now applying significant figure rules the answer is rounded to 3 digits and wrote in scientific notation making the final answer 5.44 x 10^24
what functional group would be expected to be present in the final product between 1-hexyne and a mixture
The functional group that is expected to be present in the final product between 1-hexyne and mixture of mercuric sulfate and aqueous sulfuric acid is Ketone.
What is ketone?In organic chemistry, ketone is a functional group with the structure R–C–R', where R and R' can be various carbon-containing substituents. Ketones contain a carbonyl group –C– and the simplest ketone is acetone, with the formula CH₃CCH₃.
The reaction between 1-hexyne and mercuric sulphate in the presence of aqueous Sulphuric acid is a reaction that forms a product containing a carbonyl group.
The reaction occurs in alkynes but product formed depends on the structure of the alkyne. An aldehyde or ketone can be formed depending on the structure of the alkyne.
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Note: The question given on the portal is incomplete. Here is the complete question.
Question: What functional group would be expected to be found in the major, and final, organic product upon completion of the reaction between 1-hexyne and a mixture of mercuric sulfate and aqueous sulfuric acid?
HELP ME PLEASE WILL GIVE BRAINLIEST
Answer:
2mg+2hcl------>mgcl2+h2
Answer: When magnesium reacts with hydrochloric acid, it produces magnesium chloride and hydrogen gas. To write the formula for this reaction, we first need to identify the elements involved and their respective chemical symbols. The chemical symbol for magnesium is Mg, the symbol for hydrochloric acid is HCl, and the symbol for hydrogen is H.
Next, we need to balance the equation by making sure that the number of atoms of each element is the same on both sides of the arrow. In this case, we have one atom of magnesium on the left side of the arrow and one atom of hydrogen on the right side. However, we also have one atom of chlorine on the left side and two atoms of hydrogen on the right side. To balance the equation, we need to add a coefficient of 2 in front of the HCl on the left side, so that the equation becomes:
Mg + 2 HCl -> MgCl2 + H2
This balanced equation shows that for every one atom of magnesium that reacts with two atoms of hydrochloric acid, two atoms of magnesium chloride and two atoms of hydrogen gas are produced.
After assembling a gravity filtration apparatus, begin the separation of a mixture by choose. It into the filter paper. Pour the entire contents of the mixture into the filter paper, choose. The solid in the filter paper if needed to speed up the filtration. After all the liquid has drained through the filter paper, finish by rinsing the solid with choose. .
After assembling a gravity filtration apparatus, begin the separation of a mixture by [DECANTING ] it into the filter paper.
What are the steps?
After assembling a gravity filtration apparatus, begin the separation of a mixture by [DECANTING ] it into the filter paper. Pour the entire contents of the mixture into the filter paper, [ STIRRING ] the solid in the filter paper if needed to speed up the filtration. After all the liquid has drained through the filter paper, finish by rinsing the solid with [ SOLVENT ]
After a mixture has been poured through filter paper, the [ SOLID ] component remains on top while the [ LIQUID ] flows through. To collect the solid, spread the filter paper [ ON A WATCH GLASS ] and allow the solvent to [ EVAPORATE ].
Once the vacuum filtration set-up is complete, start by [ ADDING A SMALL AMOUNT OF WATER ] in the filter funnel. then, [ SLOWLY DECANT ] the mixture [ INTO THE MIDDLE OF THE FILTER PAPER ]
Thus, After assembling a gravity filtration apparatus, begin the separation of a mixture by [DECANTING ] it into the filter paper.
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Covalent compounds Need you guys
a. The names for the chemical compounds in the task given above are as follows:
CO₂: Carbon dioxideP5N7: Pentaphosphorus heptanitride.CO: Carbon monoxideP5Br3: Pentaphosphorus tribromideSF6: Sulfur hexafluorideN2O8: Nitrooxyperoxy nitrateSCl4: Sulfur tetrachlorideSi2Br9: Disilicon nonabromideMg3P2: Magnesium phosphideBaO: Barium oxideCa3N2: Calcium nitrideLiI: Lithium iodideb. The formula for the compound given above are:
Chlorine dioxide: ClO₂Dinitrogen trioxide: N₂O₃Phosphorus pentoxide: O₁₀P₄Dihydrogen monoxide: H₂OHexaboron monosilicide: B6SiChlorine dioxide: ClO₂Hydrogen monoiodide: HIHexaboron hexasilicide: B6Si6.What is a compound?It is a substance formed between two two or more different elements which are chemical compound together and whose properties are entirely different from the properties of the contribution elements.
In conclusion, we can now confirm from the explanation given above that a compound could be ionic or molecular.
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if a fractional distillation failed to separate two components efficiently, what alternatives would one consider to effect a clean separation by distillation?
Wrap an insulator, such as aluminum foil, around the distillation column. The insulation will enable the vapors to ascend to the column's top and exit through the condenser.
What determines fractional distillation's efficacy?Fractional distillation is more effective when the two liquids in the mixture have similar boiling points, typically with a difference of less than 40 degrees Celsius (104 degrees Fahrenheit).
How should distilled water be made in order to be most effective?Distilling is a straightforward procedure that involves heating tap water till it turns to vapor. If there are any mineral traces, they are left behind when the vapor returns to becoming water. The resultant condensed liquid is distilled water.
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HELP!!!!!!!!!!!!!Rank the following elements by increasing atomic radius: carbon, aluminum, oxygen, potassium.
Answer:
oxygen<carbon<aluminium<potassium
Explanation:
atomic radius increases down the group but decreases across the period
A solution is prepared by dissolving 23. 7 g of cacl2 in 375 g of water. The density of the resulting solution is 1. 05 g/ml. The concentration of cacl2 is __________% by mass.
A solution is prepared by dissolving 23. 7 g of cacl2 in 375 g of water. The density of the resulting solution is 1. 05 g/ml. The concentration of cacl2 is 0.5623 % by mass.
What is density?
How closely a material is packed together is determined by its density. The mass per unit volume is how it is formally defined. Symbol for density: D or Formula for Density: Where is the density, m is the object's mass, and V is its volume, the equation is: = m/V.
The density of a substance is a measurement of how tightly or loosely it is confined within a specific volume. We can travel through low-density materials like air, which has a density significantly lower than that of human tissue. Granite is a different material altogether. Never attempt to traverse stone.
Therefore, A solution is prepared by dissolving 23. 7 g of cacl2 in 375 g of water. The density of the resulting solution is 1. 05 g/ml. The concentration of cacl2 is 0.5623 % by mass.
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what is single displacement in acid properties.
Single displacement in acid properties is a kind of oxidation-reduction chemical reaction.
A chemical reaction is a process that leads to the transformation of one set of chemicals into another chemical. It is also known as a single replacement reaction.
It is a reaction in which one element is substituted with another element. When a replacement reaction occurs, a pure element and an aqueous compound are formed. It is denoted as:
A + BC ⇒ AC + B were, A and B are pure elements.
Acids react with metals to form salt and hydrogen gas. The metals that are more active than acids can undergo a single displacement reaction. Due to this, the acid will be replaced by the metal, but it does not apply to less reactive metals.
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a gaseous mixture of o2 and n2 contains 40.8 % nitrogen by mass. what is the partial pressure of oxygen in the mixture if the total pressure is 345 mmhg ?
A gaseous combination of oxygen and nitrogen with a mass percentage of 40.8% has a partial pressure of oxygen of 160.77 mmHg and a total pressure of 345 mmHg.
How do partial and total pressure differ?When we have a combination of two or more gases in a given volume, the word partial pressure is used to indicate the pressure that is brought on by each individual gas in the mixture. The partial pressures of the component gases are added to determine the overall pressure of the gas combination. Ptot = ∑Pi = P1 + P2 + P3 ...
We've been questioned.
A gaseous mixture of O₂ and N₂ contains 40.8% nitrogen by mass, that is, in 100 g of the mixture, there are 40.8 g of N₂. The mass of O₂ in 100 g of the mixture is:
[tex]mo_{2} = 100g - 40.8g = 59.2g[/tex]
We will convert both masses to moles using their molar masses.
[tex]n_{2}[/tex] : 40.8 g * 1 mol / 28.00 g = 1.45mol
O₂ : 40.8 *1 mol / 32.00g = 1.27mol
The mole fraction of O₂ is:
mole fraction of O₂ = nO₂ / n[tex]n_{2}[/tex] + nO₂ = 1.27 / 1.45 + 1.27 = 0.466
Given the total pressure (P) is 345 mmHg, we can calculate the partial pressure of oxygen using the following expression.
pO₂ = p * mole fraction of O₂
pO₂ = 345 * 0.466
pO₂ = 160.77mmHg
A gaseous mixture of O₂ and N₂ that contains 40.8% nitrogen by mass, and whose total pressure is 345 mmHg, has a partial pressure of oxygen of 160.77 mmHg.
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you performed a liquid-liquid extraction to isolate isopentyl acetate. was the isopentyl acetate a component of the organic layer or of the aqueous layer?
Isopentyl acetate is found in organic layer.
What do aqueous layer and organic layer mean?In this procedure, the organic product is isolated from inorganic substances. The organic product will be soluble in an organic solvent (organic layer) while the inorganic substances will be soluble in water (aqueous layer).
Solvents with significant dipole moments, the ability to separate charges, and the capacity to dissolve ions and other polar compounds are known as polar solvents. They comprise bonds between elements like oxygen and hydrogen that have widely varied electronegativities.
Non-polar solvents are defined as solvents that are made up of atoms with marginally different electronegativities. They have bonds between elements like carbon and hydrogen that have similar electronegativities. bonds with other atoms. Bonds between atoms with similar electronegativities will lack partial charges.
due to presence of large alkyl chain in isopentyl acetate
isopentyl acetate acts as a non polar compound , so its readily soluble in organic solvents rather then polar aqueous solvent
so isopentyl acetate is found in organic layer.
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which mineral participates in all aspects of energy metabolism including glycolysis, beta-oxidation, and the tca cycle?
Every stage of energy metabolism, including glycolysis, beta-oxidation, and the tCA cycle, involve magnesium mineral.
Why is the TCA cycle regarded as an amphibolic pathway?Using ATP, several of the pathway's intermediates are converted to succinyl CoA and succinic acid during the anabolic (energy-consuming) phase of the cycle. Due to the fact that energy is both created and consumed throughout the TCA cycle, it is dubbed an amphibolic cycle.
What two purposes does the TCA cycle serve?The TCA cycle generates NADH and FADH2 by oxidizing acetyl CoA obtained from carbohydrates, fatty acids, amino acids, and ketone bodies. Additionally, the TCA cycle offers the intermediates needed to produce glucose, lipids, and amino acids.
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You add 100.0 g of water at 60.0 °C to 100.0 g of ice at 0.00 °C. Some of the ice melts and cools the water to 0.00 °C. When the ice and water mixture has come to a uniform temperature of 0 °C, how much ice has melted?
By deducting the mass of the cup and water from the combined mass of the cup, water, and ice cubes, you may find the mass of the ice cubes. The mass of the ice cubes would be 110.4 g - 103.4 g = 7.0 g if the cup, water, and ice collectively weighed 110.4 g.
What size is the melting mass of ice?Both no particles are lost and no particles are gained. Additionally, the particles' size and shape do not alter. As a result, during phase change, matter and mass (or weight) are conserved (remain the same).
How do you figure out how much heat ice gains?Energy gained by the ice equals the sum of the energy lost by the thermometer and the water. Using a polystyrene container in place of a copper container.
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what is the final volume of a gas that initially occupies 2.50 l at 298 k and is subsequently heated to 321 k? (assume the pressure is constant and no gas particles are lost.)
The volume of the gas at 321 K would be 2.69 Litres, if the volume of gas at 298 K is 2.5 L
Since the pressure depends on the number of moles, it will remain constant and rest of formula is
[tex]\frac{Volume_{Intial} }{temperature_{inital}}[/tex] = [tex]\frac{Volume_{Final} }{temperature_{final} }[/tex]
which on cross multiplying becomes :
Volume(f) = (Volume(i) X temperature(f)) / temperature(i)
Volume = (2.5 * 321) / 298 = 2.69 Liters
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what is the lewis structure for carbon tetraiodide, which contains one carbon and four iodine atoms?
The lewis structure for carbon tetraiodide, which contains one carbon and four iodine atoms is carbon has four electrons in its valence shell(2s22p2).
Lewis structures, also known as Lewis dot formulas, electron dot structures, or Lewis electron dot structures (LEDS), are diagrams that show how atoms interact with one another inside of molecules as well as any lone pairs of electrons that may be present. Lewis structures can be found in coordination compounds as well as any molecule having a covalent bond. The Lewis structure was initially introduced by Gilbert N. Lewis in his 1916 article The Atom and the Molecule. Lewis structures expand on the concept of the electron dot diagram by adding lines between atoms to represent shared pairs in a chemical bond.
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Why do you think that Mercury and Mars have the same gravitational
acceleration, but different masses?
Answer: well, i'm pretty the mass part came down to how well the atoms all bonded with each other after they were scattered into space after a supernova explosion.
Explanation:
and to be honest... i'm not sure about the gravitational explanation. i assumed that gravitational acceleration depended on an individual object's mass/weight...
How many mg are in 0.750 moles of zinc?
Answer:
To find the number of milligrams (mg) in 0.750 moles of zinc, you will need to know the atomic weight of zinc. The atomic weight of zinc is 65.38 g/mol.
To convert from moles to milligrams, you will need to multiply the number of moles by the atomic weight of zinc and then multiply by 1000 to convert the weight to milligrams.
Thus, the number of milligrams in 0.750 moles of zinc is:
0.750 moles * 65.38 g/mol * 1000 mg/g = 48.7850 mg
So there are approximately 48.79 mg of zinc in 0.750 moles of the element.
Explanation:
calculate the molecular weight (g/mol) of a gas if 35.44 g of the gas stored in a 7.50 l tank exerts a pressure of 60.0 atm at a temperature of 35.5 oc.
The molecular weight (g/mol) of a gas if 35.44 g of the gas stored in a 7.50 l tank exerts a pressure of 60.0 atm at a temperature of 35.5 oc is 1.99 g per mole.( By the ideal gas equation).
How to solve?the ideal gas law: PV = nRT
P=60.0 atm, V = 7.5 L, T = 35.5 oC = (35.5+273) K = 308.5K
n = 35.44g
PV/RT =n
(60.0)(7.5)/0.821)(308.5) = 17.8 mol
M = 35.44/17.8 = 1.99 g/mol.
What is Charles Law and Boyle's law?Boyle's Law tells us, the volume of gas increases as the pressure decreases. Charles' Law tells us, the volume of gas increases as the temperature increases. And Avogadro's Law tell us ,the volume of gas increases as the amount of gas increases.
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