S is more metallic than Cl and Al is more metallic than indium and As is more metallic than Br.
In a period when we move across, from left to right then there will be an increase in electronegativity and also there will be an increase in non-metallic character of the elements.
As sulfur (S) belongs to group 16 element and chlorine (Cl) belongs to group 17 element. Thus, sulfur (S) is more metallic in nature than chlorine.
Therefore, chlorine (S) is less metallic than chlorine (Cl).
Both indium (I) and aluminium (Al) belongs to group 13 elements. And, when we move down in the group then there will be an increase in non-metallic character of the elements. As indium belongs to group 13 and period 5 wherein aluminium belongs to group 13 and period 3.
Thus, aluminium (Al) is more metallic than indium (In).
Arsenic (Ar) belongs to 15 element and bromine (Br) belongs to group 17 element. Thus, arsenic is more metallic than bromine.
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One mole of S₈ molecule contains
• 1 molecule
• 8 molecules
• 8NA atoms
• NA atoms
Answer:
NA atoms
6.02 × 10²³ atoms
A boxer punches a punching bag with a force of 1300 Newtons. How much force does the punching bag exert on the boxer when his fist collides with the bag?
Answer:
The punching bag exerts a force of 1300 Newtons on the boxer.
Explanation:
The punching bag exerts 1300 Newtons on the boxer because Newton's third law says that "every action has an equal and opposite reaction" which means that for example, as the boxer punches the punching bag, the boxer exerts a force of 1300 Newtons to the right. The punching bag at the same time exerts a force of 1300 Newtons to the left against the boxer. So "every action" would be the boxer pushing on (punching) the bag and the bag moving (for example) to the right, away from the boxer, "equal and opposite reaction" would be the punching bag pushing against the boxer (during contact) and moving to the left, which is cause for the back and forth movement of the bag after contact with the boxer.
(Sorry for the long-winded explanation, hope this helps!)
If a system has 325 kcal
of work done to it, and releases 5.00×102 kJ
of heat into its surroundings, what is the change in internal energy (Δ or Δ)
of the system?
Internal energy of the system is 1278 kJ.
What is Internal Energy?
It refers to the intangible microscopic energy at the atomic and molecular scales, which is distinct in scale from the macroscopic organised energy associated with moving objects. For instance, a glass of water on a table at room temperature appears to have no apparent energy, either potential or kinetic.
∆U = w + q
U = modification of internal energy =?
W = work equals +425 kcal (positive sign because work is done on the system)
lthough I'm not sure you intended to use separate units (kcal and kJ), I'll presume you did so in order to solve the problem. Don't convert them if they should be the same, such as in the case of kJ.
425 kcal plus 4.184 kJ per kcal equals 1778 kJ of labor, or w.
∆U = +1778 + (-500 kJ) (-500 kJ)
∆U = +1278 kJ
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CO2 + 2LiOH = Li2CO3 + H2OTo ensure that the air in the shuttle remains free of excess CO2, engineers test the air-purification system.They combine 1.000 × 10^3 g LiOH with 8.80 × 10^2 g CO2. The reaction produces 3.25 × 10^2 g H2O.What is the theoretical yield of this test reaction?
The limiting reagent in the process is carbon dioxide, and the theoretical yield is 360 g.
Explained: The equation: is used to determine the number of moles.Moles = given mass divided by molecular mass (1)
For LiOH:
LiOH has a mass of 1.00 103 g.
LiOH has a molar mass of 23.95 g/mol.
Equation 1 is solved with the following values: Moles of LiOH = 1.00103g/23.95g/mole=41.75mole
For carbon dioxide: Given mass of carbon dioxide = 8.8×10²g
Carbon dioxide has a molecular mass of 44 g/mol.
Equation 1 is solved with the following values: Moles of carbon dioxide = 8.8 102 g/44 g/mole = 20 moles.
The following is the chemical formula for the reaction between carbon dioxide gas and lithium hydroxide:
2LiOH(s)+Co2(g)⇒Li₂Co₃(s)+H²O(l)
Using the reaction's stoichiometry:
2 moles of lithium hydroxide and 1 mole of carbon dioxide react.
Thus, the reaction between 20 moles of carbon dioxide.
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rusting is the common name for the corrosion of iron or steel. the brown-orange rust commonly seen on iron or steel cars, nails, chains, or posts has the formula fe2o3. what is its iupac name?
IUPAC name for Rust is Iron (III) Oxide. Its common name is corrosion mostly seen in iron or steel.
Rust is the common name for iron oxide. The most familiar form of rust is the reddish coating that forms flakes on iron and steel (Fe2O3) but rust also comes in other colors including yellow, brown, orange, and even green. The different colors reflect various chemical compositions of rust. Rust specifically refers to oxides on iron or iron alloys such as steel. There is tarnish on silver and verdigris on copper. The chemical name of rust is iron oxide is iron (III) oxide. The familiar red form of rust is Fe2O3. but iron has other oxidation states, so it can form other colors of rust. Rust forms when iron or its alloys are exposed to moist air. The oxygen and water in air react with the metal to form the hydrated oxide.
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A food web is shown below.
A drought in this ecosystem makes the ground become very dry. Which of the following would most likely result from this change?
A.
The grass will grow more rapidly, which will cause a decrease in the impala population.
B.
The grass will shrivel and die, which will cause a decrease in the impala population.
C.
The grass will grow more rapidly, which will cause a decrease in the cheetah population.
D.
The grass will shrivel and die, which will cause an increase in the cheetah population.
Answer: B
Explanation:
(b) Explain using physical properties of the gas why ammonia is not collected by downward delivery
Explanation:
★ ᴇxᴘʟᴀɪɴ ᴜꜱɪɴɢ ᴘʜʏꜱɪᴄᴀʟ ᴘʀᴏᴘᴇʀᴛɪᴇꜱ ᴏꜰ ᴛʜᴇ ɢᴀꜱ ᴡʜʏ ᴀᴍᴍᴏɴɪᴀ ɪꜱ ɴᴏᴛ ᴄᴏʟʟᴇᴄᴛᴇᴅ ʙʏ ᴅᴏᴡɴᴡᴀʀᴅ ᴅᴇʟɪᴠᴇʀʏ ★
ΛЛらƜƐ尺 :-
=》ꜱɪɴᴄᴇ ᴀᴍᴍᴏɴɪᴀ ɢᴀꜱ ɪꜱ ʟɪɢʜᴛᴇʀ ᴛʜᴀɴ ᴀɪʀ ᴛʜᴇʀᴇꜰᴏʀᴇ ɪᴛ ɪꜱ ᴄᴏʟʟᴇᴄᴛᴇᴅ ʙʏ ᴅᴏᴡɴᴡᴀʀᴅ ᴅɪꜱᴘʟᴀᴄᴇᴍᴇɴᴛ ᴏꜰ ᴀɪʀ. ᴀᴍᴍᴏɴɪᴀ ɪꜱ ꜱᴏʟᴜʙʟᴇ ɪɴ ᴡᴀᴛᴇʀ ᴛʜᴇʀᴇꜰᴏʀᴇ ᴄᴀɴɴᴏᴛ ʙᴇ ᴄᴏʟʟᴇᴄᴛᴇᴅ ᴏᴠᴇʀ ɪᴛ
what is the approximate atomic mass (in u ) of the daughter atom? ignore recoil of the daughter nucleus.
The approximate atomic mass (in u ) of the daughter atom is 234.04 u if we ignore the recoiling of the daughter nucleus.
Since it is known to us that an alpha emission of the daughter nucleus is 234.90 Th (Thorium 23 )
On converting the kinetic energy to atomic mass we get:
4.01 MeV/931.5 MeV/u = 0.0043048 u
The mass of the Uranium is 238.050783u and the alpha particle is 4.002602 u.
Therefore,
The remaining mass = 238.050783 - (4.002602 + 0.0043048)
= 234.0438762 u
The remaining mass = 234.04u
Therefore, the final remaining mass of the daughter nucleus is 234.04u if we ignore the recoiling of the daughter nucleus.
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The approximate atomic mass (in u ) of the daughter atom is 234.04 u if we ignore the recoiling of the daughter nucleus.
Since it is known to us that an alpha emission of the daughter nucleus is 234.90 Th (Thorium 23 )
On converting the kinetic energy to atomic mass we get:
4.01 MeV/931.5 MeV/u = 0.0043048 u
The mass of the Uranium is 238.050783u and the alpha particle is 4.002602 u.
Therefore,
The remaining mass = 238.050783 - (4.002602 + 0.0043048)
= 234.0438762 u
The remaining mass = 234.04u
Therefore, the final remaining mass of the daughter nucleus is 234.04u if we ignore the recoiling of the daughter nucleus.
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which statement best describes what occurs when a polar molecule like so2 is mixed with water? select one: a. so2 dissolves and dissociates in water, forming ion-dipole attractions with the water molecules. b. so2 dissolves in water and forms dipole-dipole attractions with the water molecules. c. so2 dissolves and dissociates in water, forming dipole-dipole attractions with the water molecules. d. so2 does not dissolve in water.
Answer:SO2 dissolves in water and forms dipole-dipole attractions with the water molecules.
Explanation:
i got it right
The statement best describes what occurs when a polar molecule like so2 is mixed with water is so2 dissolves in water and forms dipole-dipole attractions with the water molecules. Therefore, option B is correct.
What is polar molecule ?A polar molecule is one that has a slight positive charge on one end and a slight negative charge on the other. A polar molecule is a diatomic compound, such as HF, that contains a polar covalent link.
The molecule's form is to blame for this. Polar molecules include those in water. Inside the molecule, there are two polar bonds. The twisted, non-symmetrical structure of the molecule results in its polar nature (it has a and side).
A water molecule has two poles: a positive charge on the hydrogen pole (side) and a negative charge on the oxygen pole due to the unequal sharing of electrons between the atoms and the asymmetrical form of the molecule (side).
Thus, option B is correct.
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How many grams of CO would be required to generate 635 g CO2?
Fe2O3 + 3CO → 2Fe + 3CO2 CO: 28.01 g/mol CO2: 44.01 g/mol
[?] g CO₂
Answer:
14.43 moles
Explanation:
I don't know... the interwebz said soz
an electronic interaction that stabilizes alkenes and carbocations and results from overlap of a vacant p orbital on one atom with the neighboring c-h sigma bond is known as
an electronic interaction that stabilizes alkenes and carbocations and results from overlap of a vacant p orbital on one atom with the neighboring c-h sigma bond is known as Hyperconjugation.
The delocalization of the sigma electrons in the C-H bond of an alkyl group coupled to an atom in an unsaturated system or to an atom with an unshared p orbital is known as hyperconjugation, which is a general stabilizing interaction. When a suitable attacking reagent is present in an organic molecule, electron displacement happens.
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help quick, please i need to get this done tonight
The percent yield of the magnesium oxide in this context is 87.3%.
What is the percentage yield?We know that the percentage yield has to do with the amount of the product that we get from the reaction expressed as a percentage. We know that the combination of the magnesium and the oxygen molecule would lead to the formation of the magnesium oxide.
The oxygen and the magnesium are the reactants while the magnesium oxide is the product.
Mass of magnesium = Mass of magnesium and crucible - mass of crucible
= 38.06 g - 35.67 g
= 2.39 g
Number of moles of Mg = 2.39 g/24 g/mol
= 0.0996 moles
Mass of magnesium oxide = Mass of magnesium oxide and crucible - mass of crucible
= 39.15 g - 35.67 g
= 3.48 g
Number of moles of the magnesium oxide = 3.48 g/40 g/mol
= 0.087 moles
From the reaction;
2 moles of Mg produces 2 moles of MgO
Hence the theoretical yield of the Mgo is 0.0996 moles
Percent yield = Actual yield/ Theoretical yield * 100/1
= 0.087 moles/ 0.0996 moles * 100/1
= 87.3%
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what mechanistic intermediate is used to explain the preference for addition of the br atom , of hbr, to the internal carbon of a terminal alkyne
The mechanistic intermediate that is used to explain the preference for addition of the Br atom , of Hbr, to the internal carbon of a terminal alkyne is free-radical conditions.
The addition of HBr to an alkyne under free-radical conditions is governed by the addition of a Br atom to the alkyne which helps in giving the most stable alkyl radical possible. The addition of HBr in the absence of radicals is governed by the addition of a proton to the double bond which helps in giving the most stable carbocation possible.
A molecule wherein a carbon atom has a fine fee and three bonds is known as a carbocation. We can basically say that they are carbon cations. Later, it forms into carbonium ion. Any even-electron cation that possesses a big effective charge at the carbon atom is known as an carbocation.
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what is the IUPAC name for C2H5
The IUPAC name for C2H5 is ethyl radical.
Ethyl is a Radical formed from Ethane. Ethane is a chemical compound, which is a colorless and odorless gas. It is a non-polar dispersion force.
Ethyl is also known as ethyl alcohol or ethanol. It is a flammable liquid that is toxic. It is used by medical practitioners, mainly in hand sanitizers.
Ethyl is an organic hydrocarbon molecule. IUPAC is an international federation that represents chemistry and its related tools and techniques. It is a part of the International Science Council, and helps in designing various chemical structures, names and standards.
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Given 45.73 moles of BCl3, how many grams are present?
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.98grams are present in 45.73 moles of BCl[tex]_3[/tex].
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. The stoichiometry represents the number of moles.
Mathematically,
number of moles of BCl[tex]_3[/tex] =given mass of BCl[tex]_3[/tex] ÷ molar mass of BCl[tex]_3[/tex]
Molar mass of 1 mole of BCl[tex]_3[/tex] = 46.264 g/mol
number of moles of BCl[tex]_3[/tex] = 45.73 moles
Substituting all the given values in the above equation, we get
45.73 moles =mass of BCl[tex]_3[/tex]÷46.264 g/mol
mass of BCl[tex]_3[/tex] =0.98grams
Therefore, 0.98grams are present in 45.73 moles of BCl[tex]_3[/tex].
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What is matter made of?
A. Chemicals
B. Tiny particles that have mass
C. Philosophical thought
D. Energy waves
A matter is made up of Tiny particles which contain mass, and are too small to be seen. Option B is the correct answer.
A matter consists of atoms and consist of protons, neutrons, and electrons. Both the protons and neutrons are placed in the nucleus, which is the center of an atom.
Matter can occupy space and has mass, and matter consists of many phases and it can take different forms. The matter is generally in the form of a solid, liquid, or gas.
The matter is also made up of tiny particles called atoms!
There are three main states of matter They are, solid, liquid, and gas. Water is one of the substances that exist in all three states.
1. SOLID:
The solid Molecules are tightly packed together even if they don’t move.Particles in a solid have strong bonds with each other.Solids have a fixed volume and shape.Examples of solids are: metals, wood
2. LIQUID:
Liquid Molecules can move around and bump each other.Liquids have a fixed volume but they can change their shape.Examples of liquids: are water and oil.
3. GAS:
Molecules that are far apart and can move around freely and quickly.The gas does not contain a fixed volume and shape.Gases can be compressed.To Read about Matter:
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When calcium (ca) is mixed with hydrochloric acid (hcl), a single-displacement reaction occurs. What will be the product or products?.
The product of this reaction is calcium chloride (CaCl2) and hydrogen gas (H2).
For this reaction, we have single displacement reaction.
What is a single displacement reaction?
A single displacement reaction is a type of chemical reaction in which one element exchanges its place with another element in a compound. This type of reaction is also known as a single replacement reaction or a substitution reaction. In a single displacement reaction, the elements involved must be different. Examples of single displacement reactions include the reaction between magnesium and hydrochloric acid to produce magnesium chloride and hydrogen gas, and the reaction between zinc and sulfuric acid to produce zinc sulfate and hydrogen gas.
In this reaction, Calcium (Ca) metal is seen reacting with Hydrochloric acid (HCl). The Ca replaces the H in HCl and we end up with CaCl2 and H2.
The resulting reaction is CaCl2 + H2.
The complete reaction is:
Ca + 2HCl ---> CaCl2 + H2
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Predict the product of the following reaction, then balance the equation.
Mg (s) + O2(g) →
Answer:
2Mg (s) + O² (g) --> 2MgO (s)
Explanation:
the product is magnesium oxide
If you think about the water molecules as liquid water freezes, would you say they get closer together, further apart, or stay at about the same distance from one another?
Answer:Water is unusual because its molecules move further apart when it freezes. The molecules of just about every other substance move closer together when they freeze.
Explanation:
During freezing, water molecules lose energy and do not vibrate or move around as vigorously. This allows more stable hydrogen-bonds to form between water molecules, as there is less energy to break the bonds.
Composite materials are made from two or more different types of material. Which of the options are composits?
Concrete and steel
A brick
Gold
Nylon
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the correct option is option A.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.
Composite materials are made from Concrete and steel. A composite material is made up of two or more constituent materials whose properties are very dissimilar from each other.
Therefore, the correct option is option A.
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how much energy is given off when 1.00 g fe is reacted with excess oxygen according to the folllowing reaction
7.35 KJ energy is gives off when 1.00 g Fe is reacted with excess oxygen according to the reaction.
The reaction between Fe and O is as below :
4 Fe(s) + 3 O₂(g) → 2 Fe₂O₃(g)
here , Δ H = - 1652 KJ
The enthalpy change is -1658 KJ. It means the reaction gives off 1652 heat or energy.
Heat released when 1.00g of is reacted with excessive oxygen:
Moles of Iron (Fe) = [tex]\frac{1g}{56g/mol}[/tex] = 0.0178 mol
According to reaction, When 4 moles of an Iron (Fe) reacts with 3 moles of Oxygen (O) it gives 1652 Kilo Joules of Energy.
Then 0.0178 Moles of Iron (Fe) will give :
∴ [tex]\frac{1652 KJ}{4}[/tex] × 0.0178 = 7.35 KJ
So, 1.00 g of Fe reacts with an excess of oxygen to release 7.35 KJ of energy.
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help!!!!!!!!!!!!!!!!!!!!!!!!!
The mass of gallium that can be formed from the reaction of 198 g of strontium with excess molten gallium (III) nitrate is 105 g (Option C)
How do I determine the mass of gallium formed?The mass of gallium that can be formed from the reaction can be obtained as follow:
3Sr + 2Ga(NO₃)₃ → 3Sr(NO₃)₂ + 2Ga
Molar mass of Sr = 87.62 g/molMass of Sr from the balanced equation = 3 × 87.62 = 262.86 g Molar mass of Ga = 69.72 g/molMass of Ga from the balanced equation = 2 × 69.72 = 139.44 gFrom the balanced equation above,
262.86 g of Sr reacted to form 139.44 g of Ga
Therefore,
198 g of CrCl₂ will react to form = (198 × 139.44 ) / 246.86 = 105 g of Ga
Thus, the mass of Ga formed is 105 g (Option C)
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an oxygen tank used in a hospital setting has a pressure of 4.0 atm and contains 60.0% o2 and 40.0% n2 by volume. what is the partial pressure of o2 in the tank? g
An oxygen tank used in a hospital setting has a pressure of 4.0 atm and contains 60.0% O₂ and 40.0% N₂ by volume. the partial pressure of oxygen in the tank is 2.4 atm
given that :
the total pressure of gas = 4 atm
percent by volume of oxygen = 60.0 % = 0.6
percent by volume of nitrogen = 40 % = 0.4
According to the Dalton's law of partial pressure is given as :
Partial pressure = mole fraction of gas × P total
Partial pressure of O₂ = 0.6 × 4
Partial pressure of O₂ = 2.4 atm
Thus, the partial pressure of the oxygen gas is 2.4 atm.
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supposethat 0.450 moles of f3203 are reacted with an excess of aluminum and 43.6 g fe are obtained what is the % yield
The percent yield of iron is, 86.5 %
Given,
Moles of iron(III)oxide = 0.450 mole
Mass of iron = Actual yield of Fe = 43.6 g
First we have to calculate the moles of iron.
The balanced chemical reaction is,
2Al+ 2 Fe₂O₃ --> 2Fe + Al₂O₃
From the balanced reaction we conclude that
As, 1 mole of Fe₂O₃ react to give 2 mole of Fe
So, 0.450 mole of Fe₂O₃ react to give 2/1 x 0.450 = 0.9 moles of Fe
Now we have to calculate the mass of Fe.
Mass of Fe = Moles of Fe x Molar mass of Fe
Mass of Fe = (0.9mole) x (56g/mole)= 50.4g
Therefore, the mass iron produces, 50.4 g
Now we have to calculate the percent yield of Fe.
% yield of Fe = (Actual yield of Fe/ Theoretical yield of Fe) x 100%
= 43.6g/50.6g x 100% = 86.5%
Therefore, the percent yield of Fe is, 86.5 %
The question whose answer is given:
If 0.450 moles of iron III oxide (Fe2O3) are allowed to react with an excess of aluminum (Al) and 43.6 grams of iron (Fe) is produced, what is the percent yield of iron?
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How much 0. 02500 m nitric acid solution (in mL) is needed to titrate 125. 0 ml of a 0. 01000 M calcium hydroxide solution
The volume of nitric acid needed to titrate calcium hydroxide is 100.0 mL.
The reaction between nitric acid (HNO₃) and calcium hydroxide (Ca(OH)₂)
2 HNO₃ + Ca(OH)₂ → Ca(NO₃)₂ + 2 H₂O
Calculate the number of moles Ca(OH)₂
n = MV
n = the number of molesM = the molarityV = the volumen Ca(OH)₂ = MV = 0.01000 × 125.0 = 1.25 mmol
According to Avogadro's law, the ratio of the coefficients of each element is equal to the ratio of the number of moles.
n Ca(OH)₂ : n HNO₃ = 1 : 2
1.25 : n HNO₃ = 1 : 2
n HNO₃ = 1.25 × 2 = 2.50 mmol
Calculate the volume of HNO₃
V = n ÷ M
V = 2.50 mmol ÷ 0.02500 M
V = 100.0 mL
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How many absorptions would you expect to observe in the 13C NMR spectra of the following molecules?a) 2-Methyl-2-buteneb) trans-1,3-Dimethylcyclohexan
The absorptions would you expect to observe in the ¹³C NMR spectra of the molecules a) 2-Methyl-2-butene is 5 signals
b) trans-1,3-Dimethylcyclohexan is 8 signals.
The proton which have equivalent chemical environment will gives one signal in ¹³C NMR. the ¹³C NMR signals will tell us about the number of different set of carbon which is in equivalent environment.
a) 2-Methyl-2-butene - in this compound there are 5 carbon atoms present . all the 5 carbon atoms are having the different chemical environment ,so the ¹³C NMR will show 5 signals.
b) trans-1,3-Dimethylcyclohexan - in this compound there are 5 carbon atoms present . all the 8 carbon atoms are having the different chemical environment ,so the ¹³C NMR will show 8 signals.
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the molarity of a 1.0 molal sodium chloride solution can be obtained by using which of the following? a. volume of the solution c. solubility of glucose in water e. density of the solution b. temperature of the solution d. degree of dissociation of glucose
Volume of solution is used to calculate molarity of a 1 molal sodium chloride solution. The correct option to this question is A.
Calculating a solution's molarity involves multiplying the number of moles of solute in a solution by the number of liters of solution. The letter "M" stands for molarity.Molarity is determined by multiplying the number of moles of a given substance by the volume of the solution.The molality of a solution is determined by multiplying the moles of solute by the kilograms of solvent. An "m" in lower case indicates molality. Because molality does not rely on temperature like molarity does, we frequently express concentrations in molality when we publish. Because of this independence, it is simpler for scientists all around the world to duplicate the findings. There is a straightforward procedure to change molarity to molality:For more information on molarity kindly visit to
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what is the IUPAC name of CuBr
The name is copper bromide.
Explanation:
copper bromide is the aswer
how long would it take a hiker to travel a total distance of 25.0 km at an average speed of 5.2km/h
The time taken for the hiker to travel a total distance of 25.0 km at an average speed of 5.2 km/h is 4.8 hours
How do I determine the time?We know that speed is defined as the distance travelled per time as shown below:
Speed = Distance / time
With the above formula, we can determine the time taken for the hiker to travel a total distance of 25.0 km at an average speed of 5.2 km/h. Details below:
Distance = 25.0 KmSpeed = 5.2 Km/hTime taken =?Speed = Distance / time
5.6 = 25 / time
Cross multiply
5.6 × time = 25
Divide both sides by 5.2
Time = 25 / 5.2
Time = 4.8 hours
This, the time taken is 4.8 hours
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Substance D has the following properties:
ΔHvap = 36.0 kJ/mol
ΔHfus = 2.6 kJ/mol
Tb = 54.9 °C
Tm = -32.5 °C
Specific Heat (solid) = 4.7 J/g·°C
Specific Heat (liquid) = 2.5 J/g·°C
Specific Heat (gas) = 0.5 J/g·°C
Calculate the energy that must be removed to convert 360.5 g of substance D from a gas at 184.0 °C to a solid at -91.5°C. The molar mass of Substance D is 75 g/mol. Enter your response to the nearest kJ
The energy released by the phase change of a substance can be calculated using calorimetric equation. The energy released during conversion D from gas to solid at the specified condition is 496.58 kJ.
What is calorimetry?Calorimetry is an analytical tool used to determine the heat energy released or absorbed by a chemical or physical change. The calorimetric equation connecting the heat energy q with mass of the substance m, specific heat c and the temperature difference ΔT is written as:
q = m c ΔT .
Specific heat of the gas= 0.5 J/ g ° C
mass m = 360.5 g
temperature difference = (184 -(-91)) =275°C.
heat released q = 360.5 g × 275°C × 0.5 J/ g ° C
= 49658.87J
= 496.5 kJ
Therefore, the heat energy released from the given phase change is 496.5 kJ.
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