20150624 化學(B1習作3-4[07.])
已知:H2O(g)+C(s)+131 kJ→CO(g)+H2(g);CO(g)+1/2O2(g)→CO2(g)+283 kJ;H2(g)+1/2O2(g)→H2O(g)+242 kJ。設燃燒由1 mol碳製成的水煤氣所放的熱為xkJ,燃燒1 mol碳所放之熱為ykJ,則x-y之值為 (A)0 (B)131 (C)525 (D)393 (E)111 kJ。(Ans:B)
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