![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
已知:CH4(g)+2O2(g)=CO2(g)+2H2O(l) ΔH1=-890.3 kJ·mol-1;H2(g)+O2(g)=H2O(l) ΔH2=-285.8 kJ·mol-1。CO2气体与H2气体反应生成甲烷气体与液态水的热化学方程式为CO2(g)+4H2(g)=CH4(g)+2H2O(l)ΔH3,其中ΔH3的数值为()
A.-252.9 kJ·mol-1
B.+252.9 kJ·mol-1
C.-604.5 kJ·mol-1
D.+604.5 kJ·mol-1
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
A、-252.9 kJ·mol-1
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)