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