题目内容

X、Y、Z、W、R、Q六种短周期元素原子序数依次增大，Y、R、Q三种元素在周期表中相对位置如下：YRQ请填写下列空白：（）由X、Y两种元素形成的正四面体分子是一种常见的气体燃料．通常状况下1g该物质完全燃烧生成液态水时所释放的能量为51.25kg/mol，请写出表示其燃烧的热化学方程式：______．

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