ID: B Name: Hour: Chemistry 2: Chapter 8 Thermochemistry Quiz 2-Masterton and Hu

Question

ID: B Name: Hour: Chemistry 2: Chapter 8 Thermochemistry Quiz 2-Masterton and Hurley Multiple Choice dentify the letter of the choice that best completes the statement or answers the question. 1. Determine the heat of formation of sulfuric acid, H,SO,(0, from the following thernochemical equations: sos) + 802(g) 8SO2(g) sds) + 1200g) 8So@ H,O() + SO3(g) H,sod) 2H2(g) + O2(g) 2H2O(1) AH =-2374.6 kJ AH=-3165.8 kJ AH- -132.4k AH =-571.7 kJ a. -6244.5 k b. -1099.9 kJ c. -814.0 kJ d. -2164.7 kJ 2 e. -3869.9 kJ hulated helow calgulate the enthalpy of reaction for the combustion of

Explanation / Answer

The formation reaction is:
1/8 S8(s) + H2 (g) + 2 O2 (g) —> H2SO4 (l)

Lets use the given 4 reaction to form the above reaction
above reaction = 1/8*reaction 2 + reaction 3 + (1/2)*reaction 4
so,
delta Hf = (1/8)*delta Hf2 + delta Hf3 + (1/2)*delta Hf4
= (1/8)*(-3165.8) + (-132.4) + (1/2)*(-571.7)
= -395.725 -132.4 - 285.85
= -814.0 KJ

Answer: c

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