1.ÒÑÖª: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¡£CO₂ÓëH₂·´Ó¦Éú³É¼×ÍéÆøÌåÓëҺ̬ˮµÄÈÈ»¯Ñ§·½³ÌʽΪCO₂(g)+4H₂(g)CH₄(g)+2H₂O(l)¡¡ΔH₃,ÔòΔH₃Ϊ(¡¡¡¡)

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A.-252.9 kJ·mol^-1           B.+252.9 kJ·mol^-1

C.-604.5 kJ·mol^-1           D.+604.5 kJ·mol^-1

½âÎö:ÓɸÇ˹¶¨ÂÉ¿ÉÖªΔH₃=4ΔH₂-ΔH₁=(-285.8 kJ·mol^-1)4+890.3 kJ·mol^-1=-252.9 kJ·mol^-1¡£

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