实验测得碳单质、氢气、甲烷的燃烧热(△H)分别为-393.5 kJ/mol、-285.8 kJ/mol、-890.3 kJ/mol。则CH4(g) == C(s
题型:0101 期中题难度:来源:
实验测得碳单质、氢气、甲烷的燃烧热(△H)分别为-393.5 kJ/mol、-285.8 kJ/mol、-890.3 kJ/mol。则 CH4(g) == C(s) + 2H2(g)的反应焓变(△H)为 |
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A.-74.8 kJ/mol B.+74.8 kJ/mol C.-211kJ/mol D.+211kJ/mol |
答案
B |
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