Question 1

Calculate the work done by the system when 2 moles of hydrogen gas is produced by the following reaction in a closed container.
Zn(s)+2HCl(aq)= ZnCl2(aq)+ H2(g)

Accepted Answer

A) +4.8 kJ 
B) -4.8 kJ 
C) 0 kJ 
D) 2.0 kJ 
A) +4.8 kJ 
B) -4.8 kJ 
C) 0 kJ 
D) 2.0 kJ

Question 2

Which of the following processes is exothermic?

Accepted Answer

A) the formation of dew in the morning 
B) the melting of ice 
C) the chemical reaction in a "cold pack" often used to treat injuries 
D) the vaporization of water 
E) None of the above are exothermic. 
A) the formation of dew in the morning 
B) the melting of ice 
C) the chemical reaction in a "cold pack" often used to treat injuries 
D) the vaporization of water 
E) None of the above are exothermic.

Question 3

A 6.55 g sample of aniline (C6H5NH2,molar mass = 93.13 g/mol)was combusted in a bomb calorimeter.If the temperature rose by 32.9°C,use the information below to determine the heat capacity of the calorimeter.
4 C6H5NH2(l)+ 35 O2(g)→ 24 CO2(g)+ 14 H2O(g)+ 4 NO2(g)
ΔH°rxn= -1.28 × 104 kJ

Accepted Answer

A) 97.3 kJ/°C 
B) 38.9 kJ/°C 
C) 5.94 kJ/°C 
D) 6.84 kJ/°C 
E) 12.8 kJ/°C 
A) 97.3 kJ/°C 
B) 38.9 kJ/°C 
C) 5.94 kJ/°C 
D) 6.84 kJ/°C 
E) 12.8 kJ/°C

Question 4

In the following reaction,energy is given off.What is true in the reverse reaction?
C(s)+O2(g)= CO2(g)

Accepted Answer

A) The internal energy of the reactants increases. 
B) Energy flows from the surroundings to the system. 
C) Total energy remains constant. 
D) All of the above 
A) The internal energy of the reactants increases. 
B) Energy flows from the surroundings to the system. 
C) Total energy remains constant. 
D) All of the above

Question 5

It takes 11.2 kJ of energy to raise the temperature of 145 g of benzene from 23.0°C to 68.0°C.What is the specific heat of benzene?

Accepted Answer

A) 1.14 J/(g ∙ °
C)  
B) 1.72 J/(g ∙ °
C)  
C) 3.48 J/(g ∙ °
C)  
D) 5.25 J/(g ∙ °
C)  
A) 1.14 J/(g ∙ °
C)  
B) 1.72 J/(g ∙ °
C)  
C) 3.48 J/(g ∙ °
C)  
D) 5.25 J/(g ∙ °
C)

Question 6

Calculate the work,w,gained or lost by the system when a gas expands from 15 L to 40 L against a constant external pressure of 1.5 atm.1 L ∙ atm = 101 J.

Accepted Answer

A) -6.1 kJ 
B) -3.8 kJ 
C) +3.8 kJ 
D) +6.1 kJ 
A) -6.1 kJ 
B) -3.8 kJ 
C) +3.8 kJ 
D) +6.1 kJ

Question 7

According to the following thermochemical equation,what mass of HF (in g)must react in order to produce 345 kJ of energy? Assume excess SiO2.
SiO2(s)+ 4 HF(g)→ SiF4(g)+ 2 H2O(l)ΔH°rxn = -184 kJ

Accepted Answer

A) 42.7 g 
B) 37.5 g 
C) 150.g 
D) 107 g 
E) 173 g 
A) 42.7 g 
B) 37.5 g 
C) 150.g 
D) 107 g 
E) 173 g

Question 8

What is the minimum energy required to decompose 765 g of PCl3,according to the reaction below? The molar mass of PCl3 is 137.32 g/mol and may be useful.
4 PCl3(g)→ P4(s)+ 6 Cl2(g)ΔH°rxn = +1207 kJ

Accepted Answer

A) 2.31 × 103 kJ 
B) 4.33 × 103 kJ 
C) 6.72 × 103 kJ 
D) 1.68 × 103 kJ 
E) 5.95 × 103 kJ 
A) 2.31 × 103 kJ 
B) 4.33 × 103 kJ 
C) 6.72 × 103 kJ 
D) 1.68 × 103 kJ 
E) 5.95 × 103 kJ

Question 9

The temperature rises from 25.00 °C to 29.00 °C in a bomb calorimeter when 3.50 g of sucrose undergoes combustion in a bomb calorimeter.Calculate ΔErxn for the combustion of sucrose in kJ/mol sucrose.The heat capacity of the calorimeter is 4.90 kJ/°C .The molar mass of sugar is 342.3 g/mol.

Accepted Answer

A) ()- 1.92 × 103 kJ/mole 
B) 1.92 × 103 kJ/mole 
C) ()- 1.23 × 103 kJ/mole 
D) 2.35 × 104 kJ/mole 
A) ()- 1.92 × 103 kJ/mole 
B) 1.92 × 103 kJ/mole 
C) ()- 1.23 × 103 kJ/mole 
D) 2.35 × 104 kJ/mole

Question 10

When 5.00 mol of benzene is vaporized at a constant pressure of 1.00 atm and at its normal boiling point of 80.1°C,169.5 kJ are absorbed and PΔV for the vaporization process is equal to 14.5 kJ then

Accepted Answer

A) ΔE = 155.0 kJ and ΔH = 169.5 kJ. 
B) ΔE = 184.0 kJ and ΔH = 169.5 kJ. 
C) ΔE = 169.5 kJ and ΔH = 184.0 kJ. 
D) ΔE = 169.5 kJ and ΔH = 155.0 kJ. 
A) ΔE = 155.0 kJ and ΔH = 169.5 kJ. 
B) ΔE = 184.0 kJ and ΔH = 169.5 kJ. 
C) ΔE = 169.5 kJ and ΔH = 184.0 kJ. 
D) ΔE = 169.5 kJ and ΔH = 155.0 kJ.

Calculate the work done by the system when 2 moles of hydrogen gas is produced by the following reaction in a closed container. Zn(s)+2HCl(aq)= ZnCl₂(aq)+ H₂(g)

Which of the following processes is exothermic?

In the following reaction,energy is given off.What is true in the reverse reaction? C(s)+O₂(g)= CO₂(g)

It takes 11.2 kJ of energy to raise the temperature of 145 g of benzene from 23.0°C to 68.0°C.What is the specific heat of benzene?

Calculate the work,w,gained or lost by the system when a gas expands from 15 L to 40 L against a constant external pressure of 1.5 atm.1 L ∙ atm = 101 J.

According to the following thermochemical equation,what mass of HF (in g)must react in order to produce 345 kJ of energy? Assume excess SiO₂. SiO₂(s)+ 4 HF(g)→ SiF₄(g)+ 2 H₂O(l)ΔH°_rxn= -184 kJ

What is the minimum energy required to decompose 765 g of PCl₃,according to the reaction below? The molar mass of PCl₃ is 137.32 g/mol and may be useful. 4 PCl₃(g)→ P₄(s)+ 6 Cl₂(g)ΔH°_rxn = +1207 kJ

The temperature rises from 25.00 °C to 29.00 °C in a bomb calorimeter when 3.50 g of sucrose undergoes combustion in a bomb calorimeter.Calculate ΔE_rxn for the combustion of sucrose in kJ/mol sucrose.The heat capacity of the calorimeter is 4.90 kJ/°C .The molar mass of sugar is 342.3 g/mol.

When 5.00 mol of benzene is vaporized at a constant pressure of 1.00 atm and at its normal boiling point of 80.1°C,169.5 kJ are absorbed and PΔV for the vaporization process is equal to 14.5 kJ then

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Exam 6: Thermochemistry

Calculate the work done by the system when 2 moles of hydrogen gas is produced by the following reaction in a closed container. Zn(s)+2HCl(aq)= ZnCl2(aq)+ H2(g)

Which of the following processes is exothermic?

A 6.55 g sample of aniline (C6H5NH2,molar mass = 93.13 g/mol)was combusted in a bomb calorimeter.If the temperature rose by 32.9°C,use the information below to determine the heat capacity of the calorimeter. 4 C6H5NH2(l)+ 35 O2(g)→ 24 CO2(g)+ 14 H2O(g)+ 4 NO2(g) ΔH°rxn= -1.28 × 104 kJ

In the following reaction,energy is given off.What is true in the reverse reaction? C(s)+O2(g)= CO2(g)

It takes 11.2 kJ of energy to raise the temperature of 145 g of benzene from 23.0°C to 68.0°C.What is the specific heat of benzene?

Calculate the work,w,gained or lost by the system when a gas expands from 15 L to 40 L against a constant external pressure of 1.5 atm.1 L ∙ atm = 101 J.

According to the following thermochemical equation,what mass of HF (in g)must react in order to produce 345 kJ of energy? Assume excess SiO2. SiO2(s)+ 4 HF(g)→ SiF4(g)+ 2 H2O(l)ΔH°rxn = -184 kJ

What is the minimum energy required to decompose 765 g of PCl3,according to the reaction below? The molar mass of PCl3 is 137.32 g/mol and may be useful. 4 PCl3(g)→ P4(s)+ 6 Cl2(g)ΔH°rxn = +1207 kJ

The temperature rises from 25.00 °C to 29.00 °C in a bomb calorimeter when 3.50 g of sucrose undergoes combustion in a bomb calorimeter.Calculate ΔErxn for the combustion of sucrose in kJ/mol sucrose.The heat capacity of the calorimeter is 4.90 kJ/°C .The molar mass of sugar is 342.3 g/mol.

When 5.00 mol of benzene is vaporized at a constant pressure of 1.00 atm and at its normal boiling point of 80.1°C,169.5 kJ are absorbed and PΔV for the vaporization process is equal to 14.5 kJ then

Matter, Measurement, and Problem Solving

Atoms and Elements

Molecules, Compounds and Chemical Equations

Chemical Quantities and Aqueous Reactions

Gases

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding II: Molecular Shapes, Valence Bond Theory, and

Liquids, Solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Filters

Calculate the work done by the system when 2 moles of hydrogen gas is produced by the following reaction in a closed container. Zn(s)+2HCl(aq)= ZnCl₂(aq)+ H₂(g)

In the following reaction,energy is given off.What is true in the reverse reaction? C(s)+O₂(g)= CO₂(g)

According to the following thermochemical equation,what mass of HF (in g)must react in order to produce 345 kJ of energy? Assume excess SiO₂. SiO₂(s)+ 4 HF(g)→ SiF₄(g)+ 2 H₂O(l)ΔH°_rxn= -184 kJ

What is the minimum energy required to decompose 765 g of PCl₃,according to the reaction below? The molar mass of PCl₃ is 137.32 g/mol and may be useful. 4 PCl₃(g)→ P₄(s)+ 6 Cl₂(g)ΔH°_rxn = +1207 kJ

The temperature rises from 25.00 °C to 29.00 °C in a bomb calorimeter when 3.50 g of sucrose undergoes combustion in a bomb calorimeter.Calculate ΔE_rxn for the combustion of sucrose in kJ/mol sucrose.The heat capacity of the calorimeter is 4.90 kJ/°C .The molar mass of sugar is 342.3 g/mol.