The carbon concentration of an iron-carbon alloy for which the fraction of total ferrite is 0.94 is 0.423.
Alloy is a substance that is composed of two or more metals or of a metal and a non - metal which are united among themselves by fusion in their molten state.
Iron-carbon alloy is an alloy than contains iron(metal) and carbon(non-metal) as its constituents.
Carbon concentration of iron-carbon alloy is calculated as follows:
W = {C (Fe₃C) - C₀} / {C (Fe₃C) - C}
⇒ 0.94 = (6.7 - C₀) / (6.7 - 0.022)
⇒ 0.94 × 6.678 = 6.7 - C₀
⇒ 6.277 = 6.7 - C₀
⇒ C₀ = 6.7 - 6.277
⇒ C₀ = 0.423
Hence, the carbon concentration of an iron-carbon alloy for which the fraction of total ferrite is 0.94 is 0.423.
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What is the change in entropy when the divider is removed from the container and all three molecules are allowed to mix together? assume that all three molecules began on the left side of the container.
The change in entropy when the divider is removed from the container and all three molecules are allowed to mix together,as a result, the change in Entropy will be positive.
What is entropy?
Entropy is a critical concept that students must properly understand while studying Chemistry and Physics. More crucially, entropy can be defined in numerous ways and hence applied in numerous stages or instances, such as a thermodynamic stage, cosmology, and even economics. Entropy, in its most basic form, refers to the spontaneous changes that occur in everyday events or the universe's inclination toward chaos.
We do not consider the microscopic aspects of a system from the standpoint of entropy in thermodynamics. Entropy, on the other hand, is used to characterise a system's behaviour in terms of thermodynamic variables such as temperature, pressure, entropy, and heat capacity. This thermodynamic description took into account the systems' state of equilibrium.
Entropy is a physical property that is commonly associated with chaos, unpredictability, or uncertainty. Because all three molecules started on the left side of the container, they are mingled together. This suggests that molecules are organised at random.
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Question What does the law of conservation of mass state? Responses Mass can be created and destroyed during a chemical reaction. Mass can be created and destroyed during a chemical reaction. Mass can be created but not destroyed in a chemical reaction. Mass can be created but not destroyed in a chemical reaction. Mass cannot be created nor destroyed in a chemical reaction. Mass cannot be created nor destroyed in a chemical reaction. Mass can be destroyed but not created during a chemical reaction.\
According to the rule of conservation of mass, no atoms are created or destroyed during a chemical process. Instead, the atoms combine in a variety of ways to create goods.
What is law of conservation of mass ?According to the law of conservation of mass or principle of mass conservation, any system that is closed to all transfers of matter and energy must maintain a constant mass over time since the system's mass cannot vary and neither more nor less amount can be added or subtracted.
The law of conservation of mass, no atoms are created or destroyed during a chemical process. Instead, the atoms combine in a variety of ways to create goods. This is why each element has the same amount of atoms on both sides of an equation with balanced symbols.
Thus, According to the law of conservation of mass, mass is neither generated nor destroyed during a chemical process.
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for the sn1 reaction, draw the major organic product, identify the nucleophile, substrate, and leaving group, and determine the rate limiting step. c5h11i
From the given SN1 reaction (picture attached), the major organic product will be 3-ethylpentan-3-ol, the nucleophile, substrate, leaving group, and the rate-limiting step is identified in the attachment.
In the given reaction an alkyl halide 3-bromo-3-ethylpentane is used as a substrate. In the first step of the reaction, alkyl halide dissociates and a carbocation with a Bromide ion generates. The first step of the reaction mechanism is the slow and rate-determining step. In the first step, 3-bromo-3-ethylpentane is the substrate and bromide is the leaving group. In the second step, the water molecule acts as a nucleophile and attacks carbocation. In the final step, bromide removes hydrogen from the water molecule, and the product results.
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Two carbon atoms (group 14) bond with two hydrogen atoms (group 1) to form acetylene (c2h2). How would each carbon atom in acetylene bond?.
11111111111111111111111111
We can conclude that each carbon atom in acetylene shares one pair of electrons with the hydrogen atom and three pairs with the other carbon atom.
A chemical bond is a long-lasting attraction between atoms or ions that allows molecules and crystals to form. Ionic bonds are formed by the electrostatic force between oppositely charged ions, whereas covalent bonds are formed by the sharing of electrons.
Each carbon atom in acetylene shares one pair of electrons with the hydrogen atom and three pairs with the other carbon atom.
The carbon atom contains four electrons. It requires four electrons to become stable in its outermost shell. Two carbon atoms covalently bond three pairs of electrons with each other in acetylene, and the remaining pair covalently bonds with two hydrogen atoms.
As a result of the carbon and hydrogen atoms becoming more stable, we can conclude that in acetylene, each carbon atom shares one pair of electrons with the hydrogen atom and three pairs with the other carbon atom.
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What evidence did you ee that indicated the liquid from copper (11) ulfate or Tagu rate wa waterr
Evidence did you see that indicated the liquid from copper II sulfate pentahydrate was water is color change to adding water to anhydrous copper II sulfate
Copper II sulphate also known as copper sulphate is an inorganic compound with the chemical formula CuSO₄ and when liquid from copper II sulfate pentahydrate was water then the color change from pale blue to white and change back to blue when water is added and the color change on adding water to anhydrous copper II sulphate has been used as test for the presence of water in a liquid
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2. write the pertinent hydrolysis reactions of the ions in the salt solutions and explain if the ph measured is reasonable for individual salts and discuss if the measured ph values agreed with the predictions.
The pertinent hydrolysis reactions of the ions in the salt solutions are as follows:
- For the Na+ ion, the hydrolysis reaction is:
Na+(aq) + H2O(l) → NaOH(aq) + H+(aq)- For the Cl- ion, the hydrolysis reaction is:
Cl-(aq) + H2O(l) → HCl(aq) + OH-(aq)- For the SO42- ion, the hydrolysis reaction is:
SO42-(aq) + 2H2O(l) → H2SO4(aq) + 2OH-(aq)What are the pH values measured for the individual salt solutions?The measured pH values for the individual salt solutions are as follows:
NaCl: 8.0CaSO4: 8.3MgCl2: 9.0The pH values measured for the individual salt solutions are reasonable. The measured pH values agree with the prediction.
The measured pH values agree with the predictions because the measured pH values are within the range of the expected pH values for each salt.
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How does potential energy relate to bond forming?
a 4.0 m solution of kno3 has a volume of 1.8 l. if the solution is diluted to 9.0 l, what is the new concentration?
A 4.0 m solution of kno3 has a volume of 1.8 l. if the solution is diluted to 9.0 l, then the new concentration is 0.8 m
The concentration of solution of the amount of solute that has been dissolved in a given amount of solvent or solution
Here given data is
C₁ = 4.0 m
V₁ = 1.8 l
C₂ = ?
V₂ = 9.0 l
So the formula is
C₁V₁ = C₂V₂
4.0 m×1.8 l = C₂× 9.0 l
C₂ = 7.2/9.0 l
C₂ = 0.8 m
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Please help me with the problem
The following are :
(a) compound
(b) compound
(c) mixture
(d) mixture
In first one is red atom is bonded with one white atom and all the given are the same so this is an compound. in the second one the one red atom bonded with two white atom and all are the same this means this is also compound. the third one is one is bonded with same atom but it also have another atom bonded with same atom so this is a mixture. this kis exact same case in the fourth one there mixture.
Thus, The following are :
(a) compound
(b) compound
(c) mixture
(d) mixture
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Which is an example of a chemical change?
O water evaporating from a puddle
O cloth tearing when pulled
O wood forming sawdust when cut
O bread baking in an oven
Answer: bread baking in a oven and water evaporating in a puddle
Explanation:
If a reaction begins with a mixture of no2 and o2 at partial pressures of 1. 00 atm each, the reaction will be spontaneous until some n2o5 forms in the mixture. What is the maximum partial pressure of n2o5 that can build up before the reaction ceases to be spontaneous?.
The NO3 is zero atm (atmospheric pressure at sea level).
What is partial pressure?
The pressure that one gas in a gas mixture will exert if it fills the same volume by itself is referred to as partial pressure.
What is spontaneous?
A spontaneous process is one that takes place without the use of external energy. For instance, a ball will roll down an incline, water will flow downward, ice will melt into water, radioactive elements will decay, and iron will rust.
N2O(g)+NO2(g)⇌3NO(g)
dG = G products- G reactants
dG = 3*86.56696 - (104.1816 + 51.29584) = 104.22344 kJ/mol
since dG > 0, this must not favor produces, i.e. it is nonspontaneous
dG = -RT*ln(Kp)
Kp = exp(-dG/(RT))
Kp = exp(-104223.44/(8.314*298)) = 5.37818739*10^-19
Kp = NO^3 / (N2O)(NO2)
initially
NO= 0
N2O = 1
NO2 = 1
in equilibrium
NO= 0 + 3x
N2O = 1 - x
NO2 = 1 - x
substitute
5.378 *10^-19 = (3x)^3 / (1-x)(1-x)
(5.378 *10^-19)(1 -2x +x^2) = 27x^3
x = partially 0 atm
therefore
Almost no NO3 will be zero
Not possible, since
dG = dG º + RT*ln(Q)
therefore, even though we can decrease T, it will never be negative, meaning than this will be never spontaneous
Therefore, Almost no NO3 will be zero.
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Describe a method for making pure crystals of magnesium chloride from magnesium and dilute hydrochloric acid
The method for making pure crystals of magnesium chloride from magnesium and dilute hydrochloric acid is given below:
Making pure crystals of magnesium chloride from magnesium and dilute hydrochloric acidAccording to the reaction, magnesium and weak hydrochloric acid react to create magnesium chloride and release hydrogen gas.
MgCl2 (aq) + H2 from Mg (s) + 2HCl (g)
Following is the process for extracting pure magnesium chloride from the reaction.
First: Reaction
Keep a beaker with the diluted hydrochloric acid inside.Add magnesium gradually until there is an excess or until no more gas appears to be escaping.Second step: filtering
Filter using a funnel and filter paper. Remove the surplus magnesium by filtering it out because the filtrate will contain aqueous (liquid) magnesium chloride. The surplus magnesium is in the residual.To create solid crystals from the filtrate, go to:
Step three, crystallization.
Transfer filtrate solution to a dish or basin for evaporation.Transfer filtrate solution to a dish or basin for evaporation. Use a Bunsen burner to provide heat Pour the solution into a basin that will evaporate it, then warm it over a water bath.Turn off the heat when crystals begin to form.Let the water drain until only pure crystals are left.Dry crystals in a heated oven or on absorbent paper.Lastly, Precautions:
Wear eye protection, especially when heating, and use personal protective equipment such gloves and lab coats.Prevent breathing in extra gases while the process is underway.Learn more about magnesium chloride from
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calculate the number of moles of atoms in each of the following: 21. 3.01 x 1023 atoms of zinc 23. 1.806 x 1024 atoms of ba 22. 9.03 x 1023 atoms of s 24. 1.204 x 1024 atoms of na
The number of moles of atoms in each of the following is :
1) 0.5 mol
2) 2.9 mol
3) 1.49 mol
4) 1.9 mol
1) 3.01 × 10²³ atoms of zinc
3.01 × 10²³ atoms of zinc = (3.01 × 10²³) / (6.022 × 10²³) moles
= 0.5 mol
2) 1.806 × 10²⁴ atoms of Ba
1.806 × 10²⁴ atoms of Ba = (1.806 × 10²⁴ ) / (6.022 × 10²³) moles
= 2.9 mol
3) 9.03 × 10²³ atoms of S
9.03 × 10²³ atoms of S = 9.03 × 10²³ / (6.022 × 10²³) moles
= 1.49 mol
4) 1.204 × 10²⁴ atoms of Na
1.204 × 10²⁴ atoms of Na = 1.204 × 10²⁴ / (6.022 × 10²³) moles
= 1.9 mol
Thus, The number of moles of atoms in each of the following is :
1) 0.5 mol
2) 2.9 mol
3) 1.49 mol
4) 1.9 mol
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Determine the total number of atoms for each chemical formula!!
Answer:
9 for the first one
19 for the second
20 for the third
13 for the fourth
9 for the fifth
___________ is the property of a material to not change shape when squeezed
Elasticity is the property of a material to not change shape when squeezed.
Elasticity of the material is the property of a material that regain its shape after the material is stretched or compressed. This is an elastic force. whenever the material is compressed or we stretched it then the force called elastic force act on it. when the material is more stretched or more compressed than the more elastic force act on it. when we stretched the material its shape changes and when we leave it it will regain its shape.
Thus, Elasticity is the property of a material to not change shape when squeezed.
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air is composed of approximately 78% n2, 21% o2 and 1% percent other gases. calculate the density of he at stp and explain why a closed balloon filled with he rises in air
Air is composed of approximately 78% N₂, 21% O₂, and 1% percent other gases, the density of He at stp will be 0.1637 g/L
At standard, temperature, and pressure (STP) the values are:
Pressure (P) = 1 atm
Temperature (T) = 25 °C or 298.15 K
Density of helium (He) = ?
To calculate the density of He, we will use the modified form of ideal gas law as:
PV = nRT
n = number of moles
n = m / M
Put the value of n in ideal gas law
PV = mRT / M
m / V = PM / RT
Where m = mass
M = molarity
V = volume
P = pressure
T = absolute temperature
R = universal constant of gasses (value = 0.082 atm.L / mol.K)
As we know that:
Density = m / V
Put density in place of m / V, the above equation will be:
Density = PM / RT
Put the values:
Density of Helium (He) = (1 atm) × (4.0026 g/mol) ÷ (0.082 atm.L/mol.K)(298.15 K)
Density of Helium (He) = 0.1637 g/L
A ballon filled with He rises because the density of He is lower than air.
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What is the partial pressure (in atm) of co₂ at 468. 2 k in a 25. 0 l fuel combustion vessel if it contains 60. 0 grams co₂, 82. 1 g h₂o, and 7. 30 mol vaporized, yet uncombusted fuel?.
Answer:
2.09 atm
Explanation:
Given: Temperature of system. volume of system, and masses of component gasses.
In order to get the mole fraction which we will use later, convert the 60.0 g CO2 and 82.1 g H20 into moles and add the number of moles you got yo 7.30.
(60.0g CO2 / 44.01 g/mole) + (82.1g H20/18.02) + 7.30 moles unknown fuel
This should work out to about 13.22 moles total. Then, plug in your numbers to the ideal gas law (PV=nRT or P=nRT/V). This will result in the total pressure of the system. p=(13.22 moles)x(0.08206 l*ATM/moles *K)x(468.2)/25.0L. This equation results in a total of 20.3 atm. According to Daltons law of partial pressure, the mole fraction (moles of a gas over total moles) of a given gas times the total pressure of the container gives the partial pressure.
(1.36/13.22) * 20.3 atm=2.09 atm
State the empirical formula for each of the following compounds:
a) C4H8
b) C₂H6O₂
c) N₂O5
d) Ba3(PO4)2
CH2 is the empirical formula.
The simplest whole number ratio of each kind of atom in the compound serves as its empirical formula. It may be calculated using information on the mass of each component in a compound or the composition's percentage.
The number of atoms that make up a single molecule of a substance is specified by both the empirical formula and the molecular formula. Even if it doesn't usually happen, the empirical formula and molecular formula of a molecule may one day match. You must first ascertain the relative masses of the individual components in order to construct the empirical formula. Either mass data given in grams or composition% can be used.
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when comparing hclo and hbro , hclo is a acid than hbro .target 1 of 4 when comparing h2so4 and h2so3 , h2so4 is a acid than h2so3 .target 2 of 4 when comparing ccl3cooh and ch3cooh , ccl3cooh is a acid than ch3cooh .target 3 of 4 when comparing hclo2 and hclo , hclo2 is a acid than hclo .
When comparing HClO and HBrO, HClO is a stronger acid than HBrO because it has more electronegative atoms.
When comparing H₂SO₄ and H₂SO₃, H₂SO₄ is a stronger acid because it has more oxygen atoms. As we know that the higher number of oxygen atoms in oxyacids increases the acidic strength of the acid.
When comparing HClO₂ and HClO, HClO₂ is a stronger acid because it has more oxygen atoms. As we know that the higher number of oxygen atoms in oxyacids, Increases the acidic strength of the acid.
When comparing HCLO and HBrO, HClO is a stronger acid because it has more electronegative atoms. As we know that the electronegativity of chlorine is higher than that of bromine.
When comparing CCl₃COOH and CH₃COOH, CCl₃COOH is a stronger acid because it has more electronegative atoms. As we know that the electronegativity of chlorine is higher than that of oxygen.
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Glycerol (molar mass= 92.09g/mol) has an enthalpy of combustion of -1654 kJ/mol. What mass of glycerol is needed to raise the temp of 50.0g water by 30.0°C?
Glycerol (molar mass= 92.09g/mol) has an enthalpy of combustion of -1654 kJ/mol. The mass of glycerol is needed is
Q water = mc ΔT
= 500 × 4.184 × ( 100 - 20)
= 167.36 kJ
Q glycerol = 167360 J = n ΔH
167360 = n × ( 1654)
n = 0.101 mol
mass = moles × molar mass
= 0.101 × 92.09
= 9.3 g
Thus, Glycerol (molar mass= 92.09g/mol) has an enthalpy of combustion of -1654 kJ/mol. mass of glycerol is needed to raise the temp of 500 g water from 20 °C to 100 °C is 9.3 g.
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g of CO2 and g of H20 are produced when 64.0g C2H2 burn in oxygen
Gram of CO₂ and g of H₂O are produced when 64.0g C₂H₂ burn in oxygen is CO₂ is 216 g and H₂O is 44.28 g
Gram is the unit of mass or weight that is used especially in the centimeter gram-second system of measurement
Here reaction is
2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O
So, 1 mole of C₂H₂ = 2(12) + 2(1) = 26 g
1 mole of CO₂ = 12 + 2(16) = 44 g
1 mole of H₂O = 2(1) + 16 = 18 g
So, 64.0 g C₂H₂ × 1 mol/26g = 2.46 mol C₂H₂
2.46 mol C₂H₂ × 4CO₂/2C₂H₂ = 4.92 mole of CO₂
4.92 mole CO₂ × 44 g/mol = 216 g CO₂
64.0g C₂H₂×1 mol/26 g = 2.46 mol C₂H₂
2.46 mol C₂H₂×2H₂O/2 C₂H₂ = 2.46 mol H₂O
2.46 mol H₂O×18 g/mol = 44.28 g H₂O
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How many atoms of hydrogen in the product side of the balanced equation? fe + h2o ---> feo + h2.
Two atoms of Hydrogen should be on the product side of the balanced equation.
Balancing the chemical equation is the branch of chemistry which helps us in balancing the atoms that are present on both the reactants and on the product sides.
Once all the individual elements are balanced, the total number of atoms of each element on the reactant and product side are compared once again. To make sure that there are no inequalities, then the chemical equation is said to be balanced.
In the above given reactions we can see that in the reactant side there are 2 atoms of hydrogen in water molecule and in the product .
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Which product uses materials gained from smelting iron ore?
Responses
coal
coal
steel
steel
uranium
uranium
oil
oil
Answer: The Answer is Steel
Explanation:
you used naocl and nai to generate i2 in situ. you probably noted this visually by observing the formation of a red-brown color as iodine was produced. the redox equation is:
CIO- acts as the oxidizing agent from the given redox reaction
What is redox reaction?
Redox reactions are oxidation-reduction chemical reactions in which reactants undergo a change in their oxidation states. The term 'redox' is short form of reduction-oxidation.What are oxidizing agent?
An oxidizing agent is a chemical species that tends to oxidize other substances, i.e. cause an increase in the oxidation state of the substance by making it lose electrons. Common examples of oxidizing agents include halogens is, oxygen, and hydrogen peroxide (H2O2).It is the compound which oxidizes others and reduced itself.Oxidation ( reducing agent) - oxidation number increasesReduction ( oxidizing agent) - oxidation number decreasesThe oxidation state (number) of one of the element in oxidizing agent decreases.
The oxidation state of O atom = -2.
Oxidation state of Cl in ClO- :
x+(-2) = -1
x = +1
Oxidation state of Cl in Cl- = -1
Thus , the oxidation state of Cl decreases from +1 to -1 in the reaction.
So, the CIO- acts as the oxidizing agent.
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Note: The complete question is
You used NaOCl and Nal to generate I2 in situ. You probably noted this visually by observing the formation of a red-brown color as iodine was produced. The redox equation is:
2H+ (aq)+CIO- (aq)+2I− (aq)→Cl− (aq)+I2 (aq)+H2O(l)
What is acting as the oxidizing agent?
Calculate the amount of heat that must be absorbed by 10. 0 g of ice at –20°c to convert it to liquid water at 60. 0°c. Given: specific heat (ice) = 2. 1 j/g·°c; specific heat (water) = 4. 18 j/g·°c; δhfus = 6. 0 kj/mol.
The amount of heat to absorb is 6261 J
The heat capacity is the amount of heat expressed usually in Joules or calories needed to change the system by 1 degree Celsius
Here the calculation for heat is
Heat required to raise the temprature of ice form -20°C to 0°C
Then the formula for specific heat is used to calculate the amount of heat
Q = c×m×ΔT
Where Q = heat exchanged by a body
m = mass of the body
c = specific heat
ΔT = change in temprature
Then the given data is
m = 10g
Specific heat of the ice = 2.1
ΔT = 0°C - (-20°C) = 20°C
Then substituting the value
Q = 10g× 2.1× 20°C
Q = 420 J
Heat required to convert 0°C ice to 0°C water
The heat Q necessary to melt a substances depend on its mass m and this called latent heat of fusion of each substances
Q = m×ΔH fusion
Heat required to raise the temprature of water from 0°C to 60°C
m = 10g
Specific heat of water = 4.18
ΔT = 60°C -(- 0°C) = 60°C
Then substituting
Q = 10g×4.18×60°C
Q = 2508 J
Then Q total = 420J+3333J+2508J
Q total = 6261 J
The amount of heat to absorb is 6261 J
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Select the set of reactants that will form a precipitate upon mixing.
Li2S(aq) + NiCl2(aq)
Na3PO4(aq) + H2SO4(aq)
NaClO4(aq) + Fe(NO3)2(aq)
NaCl(aq) + KBr(aq)
BaCl2(aq) + LiOH(aq)
A precipitate can be produced by the combination of lithium sulfide and nickel II chloride.
What is a precipitate?The term precipitate has to do with a solid product that is obtained from an aqueous phase reaction. It is important to know that in this kind of reaction, we have two aqueous phase reactants but they combine to give an insoluble product.
In this case we have to look at the possible products of each of the reactants as we have them in the question. The question that we must ask ourselves is; which of these aqueous reactants can produce a solid product?
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the concentration of a solution expressed in moles of solute per 1 l of solution is called either the or the concentration, and is given the symbol m.
The concentration of a solution expressed in moles of solute per 1 l of the solution is called Molarity.
Concentration is the abundance of a constituent divided by way of the overall volume of an aggregate. several sorts of mathematical descriptions may be outstanding: mass concentration, molar concentration, variety concentration, and extent awareness.
The concentration of a substance is the quantity of solute found in a given amount of solution. Concentrations are normally expressed in terms of molarity, defined because of the variety of moles of solute in 1 L of answer.
The Concentration of a solution is a measure of the quantity of solute that has been dissolved in a given amount of solvent or answer. A concentrated answer is one that has a rather huge quantity of dissolved solute
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if 17.4 kg of al2o3(s), 51.4 kg of naoh(l), and 51.4 kg of hf(g) react completely, how many kilograms of cryolite will be produced?
If 17.4 kg of al2o3(s), 51.4 kg of NaOH(l), and 51.4 kg of HF (g) react completely. 89.95 kg of cryolite will be produced.
What is cryolite?It is synthesized by fusion of sodium fluoride and aluminum fluoride as a electrolyte in the reduction of alumina to aluminum metal
Given data:
mass of Al = 17.4 kg = 17.4 × 10³
mass of NaOH = 51.4kg = 51.4 × 10³
mass of HF = 51.4kg = 51.4 × 10³
Molar mass of Al₂O₃ = 102 g/mol,
Molar mass of NaOH = 40g/mol
Molar mass of HF = 20g/mol
Reaction:
Al₂O₃ + 6 NaOH + 12 HF → 2 Na₂AlF₆ + 9H₂P
Moles of:
Al₂O₃ : 17.4 × 10³ / 102NaOH : 51.4 × 10³ / 240HF : 51.4 × 10³ / 240Mole/ stoichiometry of:
Al₂O₃ : 0.17 × 10³ / 1 = 0.17 × 10³
NaOH : 0.214 × 10³ / 6 = 0.035 × 10³
HF : 0.214× 10³ /12 = 0.017 × 10³
As the mole/ stoichiometric ratio is smallest for HF, it is the limiting reagent.
Molar mass of cryolite is 210gmol and HF is 20g/mol
12 mol of HF = 2 mol of Na₃AlF₆
240 g of HF = 420 g of Na₃AlF₆
51.4 × 10³g of HF = (51.4 × 10³ × 420) / 240
= 89.95 × 10³ g or 89.95 kg of Na₃AlF₆
Hence, 89.95 kg of cryolite is produced.
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the density of solid cr is 7.15 g/cm3. how many atoms are present per cubic centimeter (cm3) of cr? cr atoms: atoms/cm3
One cubic centimeter of 7.15 g/cm³ will contain 9.2 x 10²² Cr atoms.
The density of Cr is 7.15 g/cm³.
It means, one cm³ contains 7.15 grams of Cr.
We know moles are given by,
n = mass/molar mass
n = number of atom/Avogadro number
Molar mass of Cr is 51 g/mol.
So, the number of atoms per cubic centimeter can be found as,
7.15/51 = Number of atom/6.603 x 10²³
Number of atoms = 9.2 x 10²²
So, one cubic centimeter will contain 9.2 x 10²² atoms of Cr.
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Which transition of an electron in the hydrogen atom emits a photon with the smallest amount of energy?.
The transition n 2=∞ to n 1=2 emits radiation of the lowest wavelength. This transition corresponds to the maximum energy of emitted radiation.
What is emitted radiation?
When the excited electron transitions back to a lower electron orbital, emission takes place. The radiation that is emitted is known as luminescence. At energies equal to or lower than the energy corresponding to the absorbed radiation, luminescence can be seen. Following initial absorption, one of two pathways can lead to emission.
It is equal to the ionization energy and corresponds to the energy required when an electron is completely removed from the ground state of the hydrogen atom.
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