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Use Hess's Law to Calculate the Enthalpy Change for the Reaction

Question 67

Multiple Choice

Use Hess's Law to calculate the enthalpy change for the reaction WO3(s) +3H2(g) W(s) +3H2O(g) \mathrm{WO}_{3}(s) +3 \mathrm{H}_{2}(g) \rightarrow W(s) +3 \mathrm{H}_{2} \mathrm{O}(g)
from the following data:
2 W( s) +3O2(g) 2WO3( s) ,ΔH=1685.4 kJ2H2(g) +O2(g) 2H2O(g) ,ΔH=477.84 kJ\begin{array}{l}2 \mathrm{~W}(\mathrm{~s}) +3 \mathrm{O}_{2}(g) \rightarrow 2 \mathrm{WO}_{3}(\mathrm{~s}) , \Delta \mathrm{H}=-1685.4 \mathrm{~kJ} \\2 \mathrm{H}_{2}(g) +\mathrm{O}_{2}(g) \rightarrow 2 \mathrm{H}_{2} \mathrm{O}(g) , \Delta H=-477.84 \mathrm{~kJ}\end{array}


A) 125.9 kJ
B) 252.9 kJ
C) 364.9 kJ
D) 1207.6 kJ
E) None of these choices is correct.

Correct Answer:

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