問題詳情
6. The Ostwald process for the commercial production of nitric acid from ammonia and oxygen involves the following steps:
4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)
2NO(g) + O2(g) → 2NO2(g)
3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g). The values of
for some chemicals are the following: NO(g), 90 kJ/mol；H2O(g), -242 kJ/mol； NH3(g), -46 kJ/mol； NO2(g), 34 kJ/mol； HNO3(aq), -207 kJ/mol； H2O(l), -286 kJ/mol. Use the provided values of
to calculate the value of
for the last reaction, 3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g) to be ______.
(A) -908 kJ
(B) -112 kJ
(C) -140 kJ
(D) -826 kJ
(E) -220 kJ
參考答案
答案：C
難度：計算中-1
書單：沒有書單，新增