1. The thermochemical equation showing the formation of ammonia, NH, from its elements is Nalg) + 3Ha(g) - 2NH»(g) AH - -92 kJ This equation shows that 92 kJ of heat is A. lost to the surroundings when one mole of hydrogen is used up in the reaction B. absorbed from the surroundings when one mole of nitrogen reacts C. absorbed from the surroundings when one mole of ammonia is formed D. lost to the surroundings when 2 moles of ammonia is formed 2. Given the hypothetical thermochemical equation: A+B-C•D AH - 430 kJ Which among the following statements is correct about this reaction? A. the reaction is endothermic B. the equation may be written as A•B+ 430 kJ -C +D C. the heat content of C and D is greater than the heat content of A and B D. the heat content of A and B is greater than the heat content of C and D 3. Which of the following is an example of an exothermic process? A. melting of ice B. freezing of water C. evaporation of water D. sublimation of dry ice

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1. The thermochemical equation showing the formation of ammonia, NH3
from its elements is
AH - -92 kJ
Na(g) + 3H2[g) - 2NH3(g)
This equation shows that 92 kJ of heat is
A. lost to the surroundings when one mole of hydrogen is used up in
the reaction
B. absorbed from the surroundings when one mole of nitrogen reacts
C. absorbed from the surroundings when one mole of ammonia is
formed
D. lost to the surroundings when 2 moles of ammonia is formed
2. Given the hypothetical thermochemical equation:
A +B-C+D
AH - -430 kJ
Which among the following statements is correct about this reaction?
A. the reaction is endothermic
B. the equation may be written as A +B+ 430 kJ -C +D
C. the heat content of C and D is greater than the heat content of A
and B
D. the heat content of A and B is greater than the heat content of C
and D
3. Which of the following is an example of an exothermic process?
C. evaporation of water
D. sublimation of dry ice
A. melting of ice
B. freezing of water
4. An oxyacetylene torch is a tool that mixes and burns oxygen and acetylene
to produce an extremely hot flame. This tool is used to cut steel or weld
iron and other metals. The temperature of the film can reach 3480-C. The
burning of acetylene is given by the thermochemical equation:
CH2ig + 3/2C0zi - COz + H20p
For the reaction: 2CO2ig + 2H2Op - 2C2Hzjg + 3CO21g)
What is the AH for the reaction?
AH = -1301.1 kJ
A. AH - 1301.1 kJ
B. AH - 2602.2 kJ
5. The value of AH for the reaction below is -72 kJ. How many kJ of heat are
released when 1.0 mol of HBr is formed in this reaction?
C. AH - -1301.1 kJ
D. AH - -2602.2 kJ
H2(g) + Bra(g) - 2HBrg)
C.-72
A. 144
B. 36
D. 72
B. Directions: Solve the following word problems. Write your answer on your
answer sheet.
1. If the AH for C,H4 + H2 - CHe is -65.6 kJ, what is the AH for this reaction?
CHo - CH, + H2
2. If the AH for C,H, + H2 - CHe is -65.6 kJ, what is the AH for this reaction?
2C,H, + 2H2 - 2C,He
Transcribed Image Text:1. The thermochemical equation showing the formation of ammonia, NH3 from its elements is AH - -92 kJ Na(g) + 3H2[g) - 2NH3(g) This equation shows that 92 kJ of heat is A. lost to the surroundings when one mole of hydrogen is used up in the reaction B. absorbed from the surroundings when one mole of nitrogen reacts C. absorbed from the surroundings when one mole of ammonia is formed D. lost to the surroundings when 2 moles of ammonia is formed 2. Given the hypothetical thermochemical equation: A +B-C+D AH - -430 kJ Which among the following statements is correct about this reaction? A. the reaction is endothermic B. the equation may be written as A +B+ 430 kJ -C +D C. the heat content of C and D is greater than the heat content of A and B D. the heat content of A and B is greater than the heat content of C and D 3. Which of the following is an example of an exothermic process? C. evaporation of water D. sublimation of dry ice A. melting of ice B. freezing of water 4. An oxyacetylene torch is a tool that mixes and burns oxygen and acetylene to produce an extremely hot flame. This tool is used to cut steel or weld iron and other metals. The temperature of the film can reach 3480-C. The burning of acetylene is given by the thermochemical equation: CH2ig + 3/2C0zi - COz + H20p For the reaction: 2CO2ig + 2H2Op - 2C2Hzjg + 3CO21g) What is the AH for the reaction? AH = -1301.1 kJ A. AH - 1301.1 kJ B. AH - 2602.2 kJ 5. The value of AH for the reaction below is -72 kJ. How many kJ of heat are released when 1.0 mol of HBr is formed in this reaction? C. AH - -1301.1 kJ D. AH - -2602.2 kJ H2(g) + Bra(g) - 2HBrg) C.-72 A. 144 B. 36 D. 72 B. Directions: Solve the following word problems. Write your answer on your answer sheet. 1. If the AH for C,H4 + H2 - CHe is -65.6 kJ, what is the AH for this reaction? CHo - CH, + H2 2. If the AH for C,H, + H2 - CHe is -65.6 kJ, what is the AH for this reaction? 2C,H, + 2H2 - 2C,He
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