已知:CH4(g)+2O2(g)=CO2(g)+2H2O(g) ΔH=-Q1 kJ/mol,2H2(g)+O2(g)===2H2O(g) ΔH=-Q2 kJ/mol;2H2(g)+O2(g)===2H2O(l) ΔH=-Q3 kJ/mol 常温下取体积比为4∶1的甲烷和氢气的混合气体11.2 L (已折合成标准状况),
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 21:32:52
![已知:CH4(g)+2O2(g)=CO2(g)+2H2O(g) ΔH=-Q1 kJ/mol,2H2(g)+O2(g)===2H2O(g) ΔH=-Q2 kJ/mol;2H2(g)+O2(g)===2H2O(l) ΔH=-Q3 kJ/mol 常温下取体积比为4∶1的甲烷和氢气的混合气体11.2 L (已折合成标准状况),](/uploads/image/z/4999439-47-9.jpg?t=%E5%B7%B2%E7%9F%A5%EF%BC%9ACH4%28g%29%EF%BC%8B2O2%28g%29%3DCO2%28g%29%EF%BC%8B2H2O%28g%29+%CE%94H%EF%BC%9D%EF%BC%8DQ1+kJ%2Fmol%2C2H2%28g%29%EF%BC%8BO2%28g%29%3D%3D%3D2H2O%28g%29%E3%80%80%CE%94H%EF%BC%9D%EF%BC%8DQ2+kJ%2Fmol%3B2H2%28g%29%EF%BC%8BO2%28g%29%3D%3D%3D2H2O%28l%29%E3%80%80%CE%94H%EF%BC%9D%EF%BC%8DQ3+kJ%2Fmol+%E5%B8%B8%E6%B8%A9%E4%B8%8B%E5%8F%96%E4%BD%93%E7%A7%AF%E6%AF%94%E4%B8%BA4%E2%88%B61%E7%9A%84%E7%94%B2%E7%83%B7%E5%92%8C%E6%B0%A2%E6%B0%94%E7%9A%84%E6%B7%B7%E5%90%88%E6%B0%94%E4%BD%9311.2+L+%28%E5%B7%B2%E6%8A%98%E5%90%88%E6%88%90%E6%A0%87%E5%87%86%E7%8A%B6%E5%86%B5%29%2C)
已知:CH4(g)+2O2(g)=CO2(g)+2H2O(g) ΔH=-Q1 kJ/mol,2H2(g)+O2(g)===2H2O(g) ΔH=-Q2 kJ/mol;2H2(g)+O2(g)===2H2O(l) ΔH=-Q3 kJ/mol 常温下取体积比为4∶1的甲烷和氢气的混合气体11.2 L (已折合成标准状况),
已知:CH4(g)+2O2(g)=CO2(g)+2H2O(g) ΔH=-Q1 kJ/mol,2H2(g)+O2(g)===2H2O(g) ΔH=-Q2 kJ/mol;
2H2(g)+O2(g)===2H2O(l) ΔH=-Q3 kJ/mol 常温下取体积比为4∶1的甲烷和氢气的混合气体11.2 L (已折合成标准状况),经完全燃烧后恢复至常温,则放出的热量为________________kJ.
已知:CH4(g)+2O2(g)=CO2(g)+2H2O(g) ΔH=-Q1 kJ/mol,2H2(g)+O2(g)===2H2O(g) ΔH=-Q2 kJ/mol;2H2(g)+O2(g)===2H2O(l) ΔH=-Q3 kJ/mol 常温下取体积比为4∶1的甲烷和氢气的混合气体11.2 L (已折合成标准状况),
常温下甲烷和氢气的混合气体11.2 L
物质的量为0.5mol
CH4为0.8x0.5=0.4mol
H2为0.1mol
CH4(g)+2O2(g)=CO2(g)+2H2O(g),ΔH=-Q1 kJ/mol
0.4mol 0.8mol
释放热量为Q=0.4Q1
根据下面2个方程可知
2H2(g)+O2(g)===2H2O(g) ΔH=-Q2 kJ/mol
2H2(g)+O2(g)===2H2O(l) ΔH=-Q3 kJ/mol
2H2O(g)==2H2O(l) ΔH=Q2-Q3 kJ/mol
甲烷生成的气态H2O变为液态H2O释放的热量为
Q=0.4(Q2-Q3)
2H2(g)+O2(g)===2H2O(l) ΔH=-Q3 kJ/mol
释放热量为Q=0.05Q3
总的释放热量为=0.4Q1+0.4(Q2-Q3)+0.05Q3=0.4Q1+0.45Q3-0.4Q2