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