摘要：14．已知在1×105 Pa.298K条件下.2 mol氢气燃烧生成水蒸气放出484 kJ热量.下列热化学方程式正确的是( ) A． H2O(g)=H2(g)+O2(g) △H = +242 kJ·mol-1 B．2H2(g)+O2(g)=2H2O(l) △H = -484 kJ·mol-1 C．H2(g) +O2(g) = H2O(g) △H = +242 kJ·mol-1 D．2H2(g)+O2(g)=2H2O(g) △H = +484 kJ·mol-1

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