从2H2O(l)=2H2(g)+O2(g);△H1=+571.6kJ/mol 可知:2H2(g)+O2(g)=2H2O(l);△H=—571.6kJ/mol ,即每4克H2完全燃烧时放出571.6kJ的热量,则1克H2燃烧后放出的热量为:142.9kJ .而每16克CH4燃烧后放出的热量为890.3kJ,则1gCH4燃烧后放出的热量为:55.64kJ,故它们的比为C选项.
为什么选C?已知2H2O(l)=2H2(g)+O2(g);△H1=+571.6kJ/molCH4(g)+2O2(g)—→
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已知下列两个热化学方程式:2H2(g)+O2(g)=2H2O(l)△H=-571.6kJ/molCH4(g)+2O2(g
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已知:2H 2 (g)+O 2 (g)=2H 2 O(l) △H=-571.6kJ·mol -1 CH 4 (g)+2O
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已知:2H2(g)+O2(g)=2H2O(l)△H=-571.6KJ/mol,2H2O=2H2(g)+O2(g) △H=
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已知:2H2(g)+O2(g)═2H2O(l)△H=-571.6kJ•mol-1;CH4(g)+2O2(g)═CO2(g
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已知:2H2(g)+O2(g)═2H2O(l)△H=-571.6kJ•mol-1;CH4(g)+2O2(g)═CO2(g
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已知2H2(g)+O2=2H2O(l)△H=-571.6kj/molCO(g)+1/2O2(g)=CO2(g)△H=-2
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已知:2H2(g)+O2(g)=2H2O(l) △H=571.6kj/mol
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已知: 2H2O(l) = 2H2(g) + O2(g);△H =+571.6kJ/mol
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已知:2H2(g)+O2(g)=2H2O (l);△H=-571.6kJ/mol
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已知:2H2(g)+O2(g)=2H2O (l);△H=-571.6kJ/mol