A) - 396.2 kJ
B) -200 kJ
C) -356.2 kJ
D) +200kJ
Correct Answer: D
Solution :
Key Idea: Use Hesss law to find the heat of reaction. Given: \[S(s)+{{O}_{2}}(g)\to S{{O}_{2}}(g)\,;\,\Delta H=-298.2\,kJ\] ... (i) \[S(s)+\frac{3}{2}{{O}_{2}}(g)\to S{{O}_{3}}(g)\,;\,\Delta H=-98.2\,kJ\]...(ii) \[S{{o}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g)\to S{{O}_{3}}(g),\,\,\Delta H=?\] Subtracting Eq. (i) from Eq. (ii) we get \[S{{O}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g)\to S{{O}_{3}}(g)\] \[\Delta H=-98.2-(-298.2)=200\,kJ\]
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