若CH4(g),CO2(g),H2O(l)的△fGm分别为-50.8,-394.4和-237.2KJ/mol,则298K时,CH4(g)+2O2(g)——CO2(g)+ 2H2O(l)的△rGm(KJ/mol)为A.-818 B.818 C.-580.8 D.580.8
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![若CH4(g),CO2(g),H2O(l)的△fGm分别为-50.8,-394.4和-237.2KJ/mol,则298K时,CH4(g)+2O2(g)——CO2(g)+ 2H2O(l)的△rGm(KJ/mol)为A.-818 B.818 C.-580.8 D.580.8](/uploads/image/z/851597-53-7.jpg?t=%E8%8B%A5CH4%EF%BC%88g%EF%BC%89%2CCO2%EF%BC%88g%EF%BC%89%2CH2O%EF%BC%88l%EF%BC%89%E7%9A%84%E2%96%B3fGm%E5%88%86%E5%88%AB%E4%B8%BA-50.8%2C-394.4%E5%92%8C-237.2KJ%2Fmol%2C%E5%88%99298K%E6%97%B6%2CCH4%EF%BC%88g%EF%BC%89%2B2O2%EF%BC%88g%EF%BC%89%E2%80%94%E2%80%94CO2%EF%BC%88g%EF%BC%89%2B+2H2O%EF%BC%88l%EF%BC%89%E7%9A%84%E2%96%B3rGm%28KJ%2Fmol%29%E4%B8%BAA.-818++++B.818++C.-580.8++D.580.8)
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若CH4(g),CO2(g),H2O(l)的△fGm分别为-50.8,-394.4和-237.2KJ/mol,则298K时,CH4(g)+2O2(g)——CO2(g)+ 2H2O(l)的△rGm(KJ/mol)为A.-818 B.818 C.-580.8 D.580.8
若CH4(g),CO2(g),H2O(l)的△fGm分别为-50.8,-394.4和-237.2KJ/mol,
则298K时,CH4(g)+2O2(g)——CO2(g)+ 2H2O(l)的△rGm(KJ/mol)为
A.-818 B.818 C.-580.8 D.580.8
若CH4(g),CO2(g),H2O(l)的△fGm分别为-50.8,-394.4和-237.2KJ/mol,则298K时,CH4(g)+2O2(g)——CO2(g)+ 2H2O(l)的△rGm(KJ/mol)为A.-818 B.818 C.-580.8 D.580.8
反应的自由能变为等式右边之和减去等式左边之和(所有的变化量都是后减前)
所以-394.4-237.2×2-(-50.8)=-818
所以选A