已知:2H2(g)+O2(g)=2H2O(l)△H=-571.6KJ/mol,2H2O=2H2(g)+O2(g) △H=+483.6KJ/mol.现有18g液态H2O,蒸发时吸收的热量为()A88KJB44KJC4.89KJD2.45KJ

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已知:2H2(g)+O2(g)=2H2O(l)△H=-571.6KJ/mol,2H2O=2H2(g)+O2(g)△H=+483.6KJ/mol.现有18g液态H2O,蒸发时吸收的热量为()A88KJB

已知:2H2(g)+O2(g)=2H2O(l)△H=-571.6KJ/mol,2H2O=2H2(g)+O2(g) △H=+483.6KJ/mol.现有18g液态H2O,蒸发时吸收的热量为()A88KJB44KJC4.89KJD2.45KJ
已知:2H2(g)+O2(g)=2H2O(l)△H=-571.6KJ/mol,2H2O=2H2(g)+O2(g) △H=+483.6KJ/mol.现有18g液态
H2O,蒸发时吸收的热量为()
A88KJB44KJC4.89KJD2.45KJ

已知:2H2(g)+O2(g)=2H2O(l)△H=-571.6KJ/mol,2H2O=2H2(g)+O2(g) △H=+483.6KJ/mol.现有18g液态H2O,蒸发时吸收的热量为()A88KJB44KJC4.89KJD2.45KJ
盖斯定律
2H2(g)+O2(g)=2H2O(l)△H=-571.6KJ/mol (1)
2H2O(g)=2H2(g)+O2(g) △H=+483.6KJ/mol (2)
(1)+(2)
2H2O(l)=2H2O(g) △=+88KJ/mol
所以答案:B