The value of E for a system that performs 213 kJ of work on its surroundings and loses 79 kJ ofheat is __________ kJ.A) +292B) -292C) +134D) -134E) -213Answer: B

Calculate the value of E in joules for a system that loses 50 J of heat and has 150 J of workperformed on it by the surroundings.A) 50B) 100C) -100D) -200E) +200Answer: B

The change in the internal energy of a system that absorbs 2,500 J of heat and that does 7,655 Jof work on the surroundings is __________ J.A) 10,155B) 5,155C) -5,155D) -10,155E) 71.91 10Answer: C

The change in the internal energy of a system that releases 2,500 J of heat and that does 7,655 Jof work on the surroundings is __________ J.A) -10,155B) -5,155C) 71.91 10 D) 10,155E) 5,155Answer: A

The internal energy of a system __________.A) is the sum of the kinetic energy of all of its components

B) is the sum of the rotational, vibrational, and translational energies of all of its componentsC) refers only to the energies of the nuclei of the atoms of the component moleculesD) is the sum of the potential and kinetic energies of the componentsE) none of the aboveAnswer: D

Which one of the following conditions would always result in an increase in the internal energyof a system?A) The system loses heat and does work on the surroundings.B) The system gains heat and does work on the surroundings.C) The system loses heat and has work done on it by the surroundings.D) The system gains heat and has work done on it by the surroundings.E) None of the above is correct.Answer: DThe value of E for a system that performs 111 kJ of work on its surroundings and gains 89 kJof heat is __________ kJ.A) -111B) -200C) 200D) -22E) 22Answer: D

The value of E for a system that performs 13 kJ of work on its surroundings and loses 9 kJ ofheat is __________ kJ.A) 22B) -22C) -4D) 4E) -13Answer: BWhen a system __________, E is always negative.A) absorbs heat and does workB) gives off heat and does workC) absorbs heat and has work done on itD) gives off heat and has work done on itE) none of the above is always negative.

Answer: BWhich one of the following is an endothermic process?A) ice meltingB) water freezingC) boiling soupD) Hydrochloric acid and barium hydroxide are mixed at 25 C: the temperature increases.E) Both A and CAnswer: E

Which one of the following is an exothermic process?A) ice meltingB) water evaporatingC) boiling soupD) condensation of water vaporE) Ammonium thiocyanate and barium hydroxide are mixed at 25 C: the temperature drops.Answer: DOf the following, which one is a state function?A) HB) qC) wD) heatE) none of the aboveAnswer: AWhich of the following is a statement of the first law of thermodynamics?

A) 2k 1E mv2B) A negative H corresponds to an exothermic process.C) E E Efinal initial D) Energy lost by the system must be gained by the surroundings.E) 1 cal = 4.184 J (exactly)Answer: D

The internal energy can be increased by __________.(a) transferring heat from the surroundings to the system(b) transferring heat from the system to the surroundings(c) doing work on the system

A) a onlyB) b onlyC) c onlyD) a and cE) b and cAnswer: D

A __________ H corresponds to an __________ process.A) negative, endothermicB) negative, exothermicC) positive, exothermicD) zero, exothermicE) zero, endothermicAnswer: BA __________ H corresponds to an __________ process.A) negative, endothermicB) positive, exothermicC) positive, endothermicD) zero, exothermicE) zero, endothermicAnswer: CH for an endothermic process is __________ while H for an exothermic process is__________.A) zero, positiveB) zero, negativeC) positive, zeroD) negative, positiveE) positive, negativeAnswer: EFor a given process at constant pressure, H is negative. This means that the process is__________.A) endothermicB) equithermicC) exothermicD) a state functionE) energy

Answer: CWhich one of the following statements is true?A) Enthalpy is an intensive property.B) The enthalpy change for a reaction is independent of the state of the reactants and products.C) Enthalpy is a state function.D) H is the value of q measured under conditions of constant volume.E) The enthalpy change of a reaction is the reciprocal of the H of the reverse reaction.Answer: C

Which of the following statements is false?A) Internal energy is a state function.B) Enthalpy is an intensive property.C) The enthalpy change for a reaction is equal in magnitude, but opposite in sign, to the enthalpychange for the reverse reaction.D) The enthalpy change for a reaction depends on the state of the reactants and products.E) The enthalpy of a reaction is equal to the heat of the reaction.Answer: BA chemical reaction that absorbs heat from the surroundings is said to be __________ and has a__________ H at constant pressure.A) endothermic, positiveB) endothermic, negativeC) exothermic, negativeD) exothermic, positiveE) exothermic, neutralAnswer: A

The reaction

2 2 34Al(s) 3O (g) 2Al O (s) H = -3351 kJ

is __________, and therefore heat is __________ by the reaction.A) endothermic, releasedB) endothermic, absorbedC) exothermic, releasedD) exothermic, absorbedE) thermoneutral, neither released nor absorbedAnswer: C

Under what condition(s) is the enthalpy change of a process equal to the amount of heattransferred into or out of the system?

(a) temperature is constant(b) pressure is constant(c) volume is constant

A) a onlyB) b onlyC) c onlyD) a and bE) b and cAnswer: B

The units of of heat capacity are __________.A) K/J or C/JB) J/K or J/ CC) J/g-K or J/g- CD) J/molE) g-K/J or g- C/JAnswer: B

The units of specific heat are __________.A) K/J or C/JB) J/K or J/CC) J/g-K or J/g-CD) J/molE) g-K/J or g-C/JAnswer: COf the following, fH is not zero for __________.

A) 2O (g)B) C (graphite)C) 2N (g)D) 2F (s)E) 2Cl (g)Answer: D

33) Consider the following two reactions:

A 2B H 456.7 kJ/molrxn A C H -22.1kJ/molrxn

Determine the enthalpy change for the process:2B C

A) -478.8 kJ/molB) -434.6 kJ/molC) 434.6 kJ/molD) 478.8 kJ/molE) More information is needed to solve the problem.Answer: A

The value of H for the reaction below is -72 kJ. __________ kJ of heat are released when 1.0mol of HBr is formed in this reaction.

2 2H (g) Br (g) 2HBr(g)

A) 144B) 72C) 0.44D) 36E) -72Answer: D

The value of H for the reaction below is -126 kJ. __________ kj are released when 2.00 molof NaOH is formed in the reaction?

2 2 2 22Na O (s) 2H O(l) 4NaOH(s) O (g)

A) 252B) 63C) 3.9D) 7.8E) -126Answer: B

The value of H for the reaction below is -126 kJ. The amount of heat that is released by thereaction of 25.0 g of 2 2Na O with water is __________ kJ.

2 2 2 22Na O (s) 2H O(l) 4NaOH(s) O (g)

A) 20.2B) 40.4C) 67.5D) 80.8E) -126Answer: AThe value of H for the reaction below is -790 kJ. The enthalpy change accompanying thereaction of 0.95 g of S is __________ kJ.

2 32S(s) 3O (g) 2SO (g)

A) 23B) -23C) -12D) 12E) -790Answer: C

The value of H for the reaction below is -6535 kJ. __________ kJ of heat are released in thecombustion of 16.0 g of 6 6C H (l) ?

6 6 2 2 22C H (l) 15O (g) 12CO (g) 6H O(l) A) 31.34 10B) 45.23 10C) 669D) 32.68 10E) -6535Answer: CThe value of H for the reaction below is -482 kJ. Calculate the heat (kJ) released to thesurroundings when 12.0 g of CO (g) reacts completely.

2 22CO(g) O (g) 2CO (g)

A) 32.89 10B) 207C) 103D) 65.7E) -482Answer: CThe value of H for the reaction below is -336 kJ. Calculate the heat (kJ) released to the

surroundings when 23.0 g of HCl is formed.

4 2 3CH (g) 3Cl (g) CHCl (l) 3HCl(g)

A) 177B) 32.57 10C) 70.7D) 211E) -336Answer: C

The value of H for the reaction below is -186 kJ. Calculate the heat (kJ) released from thereaction of 25 g of 2Cl .

2 2 H (g) Cl 2HCl(g) A) 66B) 25.3 10C) 33D) 47E) -186Answer: A

The enthalpy change for the following reaction is -483.6 kJ:

2 2 22H (g) O (g) 2H O(g)

Therefore, the enthalpy change for the following reaction is __________ kJ:2 2 24H (g) 2O (g) 4H O(g)

A) -483.6B) -967.2C) 52.34 10D) 483.6E) 967.2Answer: B

The value of H for the reaction below is +128.1 kJ:

3 2CH OH(l) CO(g) 2H (g)

How many kJ of heat are consumed when 15.5 g of 3CH OH(l) decomposes as shown in theequation?

A) 0.48B) 62.0C) 21.3 10D) 32E) 8.3Answer: B

The value of H for the reaction below is +128.1 kJ:

3 2CH OH(l) CO(g) 2H (g)

How many kJ of heat are consumed when 5.10 g of 2H (g) is formed as shown in the equation?

A) 162B) 62.0C) 128D) 653E) 326Answer: A

The value of H for the reaction below is +128.1 kJ:

3 2CH OH(l) CO(g) 2H (g)

How many kJ of heat are consumed when 5.10 g of CO(g) is formed as shown in the equation?A) 0.182B) 162C) 8.31D) 23.3E) 62.0Answer: D

The value of H for the reaction below is +128.1 kJ:

3 2CH OH(l) CO(g) 2H (g)

How many kJ of heat are consumed when 5.75 g of CO(g) is formed as shown in the equation?A) 23.3B) 62.0C) 26.3

D) 162E) 8.3Answer: C

The value of H for the reaction below is -1107 kJ:

22Ba(s) O (g) 2BaO(s)

How many kJ of heat are released when 5.75 g of Ba(s) reacts completely with oxygen to formBaO(s) ?A) 96.3B) 26.3C) 46.4D) 23.2E) 193Answer: D

The value of H for the reaction below is -1107 kJ:

22Ba(s) O (g) 2BaO(s)

How many kJ of heat are released when 5.75 g of BaO(s) is produced?A) 56.9B) 23.2C) 20.8D) 193E) 96.3Answer: C

The value of H for the reaction below is -1107 kJ:

22Ba(s) O (g) 2BaO(s)

How many kJ of heat are released when 15.75 g of Ba(s) reacts completely with oxygen to formBaO(s)?A) 20.8B) 63.5C) 114D) 70.3E) 35.1

Answer: B

The molar heat capacity of a compound with the formula 2 6C H SO is 88.0 J/mol-K. The specificheat of this substance is __________ J/g-K.A) 88.0B) 1.13C) 4.89D) 36.88 10E) -88.0Answer: B

A sample of aluminum metal absorbs 9.86 J of heat, upon which the temperature of the sampleincreases from 23.2 C to 30.5 C. Since the specific heat capacity of aluminum is 0.90 J/g-K,the mass of the sample is __________ g.A) 72B) 1.5C) 65D) 8.1E) 6.6Answer: B

The specific heat capacity of lead is 0.13 J/g-K. How much heat (in J) is required to raise thetemperature of 15g of lead from 22 C to 37 C?A) 2.0B) -0.13C) 45.8 10D) 29E) 0.13Answer: D

The H for the solution process when solid sodium hydroxide dissolves in water is 44.4 kJ/mol.When a 13.9-g sample of NaOH dissolves in 250.0 g of water in a coffee-cup calorimeter, thetemperature increases from 23.0 C to __________ C. Assume that the solution has the samespecific heat as liquid water, i.e., 4.18 J/g-K.A) 35.2 CB) 24.0 CC) 37.8 CD) 37.0 C

E) 40.2 CAnswer: D

H for the reaction

5 3 2IF (g) IF (g) F (g) is __________ kJ, give the data below.

2 3IF(g) F (g) IF (g) H = -390 kJ2 5IF(g) 2F (g) IF (g) H = -745 kJ

A) +355B) -1135C) +1135D) +35E) -35Answer: A

Given the following reactions2 3 2Fe O (s) 3CO(s) 2Fe(s) 3CO (g) H = -28.0 kJ

2 2 3 43Fe(s) 4CO (s) 4CO (g) Fe O (s) H = +12.5 kJ

the enthalpy of the reaction of 2 3Fe O with CO

2 3 2 3 43Fe O (s) CO(g) CO (g) 2Fe O (s) is __________ kJ.A) -59.0B) 40.5C) -15.5D) -109E) +109Answer: A

Given the following reactions2 2 2N (g) 2O (g) 2NO (g) H = 66.4 kJ

2 22NO(g) O (g) 2NO (g) H = -114.2 kJ

the enthalpy of the reaction of the nitrogen to produce nitric oxide

2 2N (g) O (g) 2NO(g)

is __________ kJ.A) 180.6B) -47.8C) 47.8D) 90.3E) -180.6Answer: AGiven the following reactions

(1) 2 22NO N O H = -180 kJ(2) 2 22NO O 2NO H = -112 kJ

the enthalpy of the reaction of nitrogen with oxygen to produce nitrogen dioxide

2 2 2N 2O 2NO

is __________ kJ.A) 68B) -68C) -292D) 292E) -146Answer: A

Given the following reactions:2 32S(s) 3O (g) 2SO (g) H = -790 kJ

2 2S(s) O (g) SO (g) H = -297 kJ

the enthalpy of the reaction in which sulfur dioxide is oxidized to sulfur trioxide

2 2 32SO (g) O (g) 2SO (g)

is __________ kJ.A) 196B) -196C) 1087D) -1384E) -543 Answer: B

Given the following reactions3 2CaCO (s) CaO(s) +CO (g) H = 178.1 kJ

2 2C(s, graphite) O (g) CO (g) H = -393.5 kJ

the enthalpy of the reaction

3 2CaCO (s) CaO(s) C(s, graphite) O (g)

is __________ kJ.A) 215.4B) 571.6C) -215.4D) -571.6E) 47.01 10Answer: BGiven the following reactions

2 2H O(l) H O(g) H = 44.01 kJ2 2 22H (g)+O (g) 2H O(g) H = -483.64 kJ

the enthalpy for the decomposition of liquid water into gaseous hydrogen and oxygen

2 2 22H O(l) 2H (g)+O (g)

is __________ kJ.A) -395.62B) -527.65C) 439.63D) 571.66E) 527.65Answer: DGiven the following reactions

2 2N (g) O (g) 2NO(g) H = +180.7 kJ2 22NO(g) O (g) 2NO (g) H = -113.1 kJ

the enthalpy for the decomposition of nitrogen dioxide into molecular nitrogen and oxygen

2 2 22NO (g) N (g) 2O (g)

is __________ kJ.A) 67.6B) -67.6C) 293.8D) -293.8E) 45.5Answer: B

Given the following reactions

2 2N (g) O (g) 2NO(g) H = +180.7 kJ2 22NO(g) O (g) 2NO (g) H = -113.1 kJ

the enthalpy of reaction for

2 24NO(g) 2NO (g) N (g)

is __________ kJ.A) 67.6B) 45.5C) -293.8D) -45.5E) 293.8Answer: CGiven the following reactions

2 2N (g) O (g) 2NO(g) H = +180.7 kJ2 2 22N O(g) O (g) 2N (g) H = -163.2 kJ

the enthalpy of reaction for

2 22N O(g) 2NO(g) N (g)

is __________ kJ.A) 145.7B) 343.9C) -343.9D) 17.5E) -145.7Answer: D

The value of H for the reaction below is -186 kJ.

2 2H (g) Cl (g) 2HCl(g)

The value of fH for HCl (g) is __________ kJ/mol.

A) 23.72 10 B) 21.27 10 C) -93.0D) -186E) +186Answer: CThe value of H for the following reaction is -3351 kJ:

2 2 32Al(s) 3O (g) 2Al O (s)

The value of fH for 2 3Al O (s) is __________ kJ.

A) -3351B) -1676C) -32.86D) -16.43E) +3351Answer: BGiven the data in the table below, H rxn for the reaction

2 3 4 2 4 2 2Ca(OH) 2H AsO Ca(H AsO ) 2H O

is __________ kJ.

A) -744.9B) -4519C) -4219D) -130.4E) -76.4Answer: D

Given the data in the table below, H rxn for the reaction

3 2 24NH (g) 5O (g) 4NO(g) 6H O(l) is __________ kJ.

A) -1172B) -150C) -1540D) -1892E) The fH of 2O (g) is needed for the calculation.Answer: AGiven the data in the table below, H rxn for the reaction

2 5 2 3 2 2C H OH(l) O (g) CH CO H(l) H O(l) is __________ kJ.

A) -79.0B) -1048.0C) -476.4D) -492.6E) The value of fH of 2O (g) is required for the calculation.Answer: D

Given the data in the table below, H rxn for the reaction

2 2 33NO H O(l) 2HNO (aq) NO(g) is __________ kJ.

A) 64B) 140C) -140D) -508E) -64Answer: CGiven the data in the table below, H rxn for the reaction

5 2 7IF (g) F (g) IF (g) is __________ kJ.

A) 1801B) -1801C) 121D) -121E) -101Answer: EGiven the data in the table below, H for the reaction

2 22CO(g) O (g) 2CO (g) is __________ kJ.

A) -566.4B) -283.2C) 283.2D) -677.0E) The fH of 2O (g) is needed for the calculation.Answer: AThe value of H for the following reaction is 177.8 kJ. The value of fH forCaO(s) is __________ kJ/mol.

3 2CaCO (s) CaO(s) CO (g)

A) -1600B) -813.4C) -635.5D) 813.4E) 177.8Answer: C

57) Given the data in the table below, H rxn for the reaction

2 2 22Ag S(s) O (g) 2Ag O(s) 2S(s) is __________ kJ.

A) -1.6B) +1.6C) -3.2D) +3.2E) The fH of S(s) and of 2O (g) are needed for the calculation.Answer: D

Given the data in the table below, H rxn for the reaction2 2 2 2Ag O(s) H S(g) Ag S(s) H O(l)

is __________ kJ.

A) -267B) -370C) -202D) -308E) More data are needed to complete the calculation.Answer: A

Given the data in the table below H rxn for the reaction2 2 32SO (g) O (g) 2SO (g)

is __________ kJ.

A) -99B) 99C) -198D) 198E) The fH of 2O (g) is needed for the calculation.Answer: CGiven the data in the table below H rxn for the reaction

3 2 2 4SO (g) H O(l) H SO (l) is __________ kJ.

A) -132B) 1496C) 704D) -704E) 32.16 10

Answer: AGiven the data in the table below, H rxn for the reaction

2 3 33Cl (g) PH (g) PCl (g) 3HCl(g) is __________ kJ.

A) -385.77B) -570.37C) 570.37D) 385.77E) The fH of 2Cl (g) is needed for the calculation.Answer: B

Given the data in the table below, H rxn for the reaction3 2 3PCl (g) 3HCl(g) 3Cl (g) PH (g)

is __________ kJ.

A) -570.37B) -385.77C) 570.37D) 385.77E) The fH of 2Cl (g) is needed for the calculation.Answer: CGiven the data in the table below and H rxn for the reaction

2 2 2 2 4SO Cl (g) 2H O(l) H SO (l) 2HCL(g) H = -62 kJ

fH of HCl(g) is __________ kJ/mol.

A) -184B) 60C) -92D) 30E) Insufficient data are given.Answer: C