化学 燃烧热以知CH4(g) +2O2(g)=CO2(g)+2H2O(l) ΔH=-Q1 KJ/mol H2(g)+1/2 O2(g)=H2O(g) ΔH=-1/2Q2 KJ/mol H2(g)+1/2 O2(g)=H2O(l) ΔH=-1/2Q3 KJ/mol常温下取体积比为4:1的甲烷和氢气的混合气体11.2L(标况),经完全燃烧
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![化学 燃烧热以知CH4(g) +2O2(g)=CO2(g)+2H2O(l) ΔH=-Q1 KJ/mol H2(g)+1/2 O2(g)=H2O(g) ΔH=-1/2Q2 KJ/mol H2(g)+1/2 O2(g)=H2O(l) ΔH=-1/2Q3 KJ/mol常温下取体积比为4:1的甲烷和氢气的混合气体11.2L(标况),经完全燃烧](/uploads/image/z/6415357-13-7.jpg?t=%E5%8C%96%E5%AD%A6+%E7%87%83%E7%83%A7%E7%83%AD%E4%BB%A5%E7%9F%A5CH4%28g%29+%2B2O2%28g%29%3DCO2%28g%29%2B2H2O%28l%29+%CE%94H%3D-Q1+KJ%2Fmol++++H2%28g%29%2B1%2F2+O2%28g%29%3DH2O%28g%29+%CE%94H%3D-1%2F2Q2+KJ%2Fmol++++H2%28g%29%2B1%2F2+O2%28g%29%3DH2O%28l%29+%CE%94H%3D-1%2F2Q3+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%EF%BC%9A1%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%9311.2L%EF%BC%88%E6%A0%87%E5%86%B5%EF%BC%89%2C%E7%BB%8F%E5%AE%8C%E5%85%A8%E7%87%83%E7%83%A7)
化学 燃烧热以知CH4(g) +2O2(g)=CO2(g)+2H2O(l) ΔH=-Q1 KJ/mol H2(g)+1/2 O2(g)=H2O(g) ΔH=-1/2Q2 KJ/mol H2(g)+1/2 O2(g)=H2O(l) ΔH=-1/2Q3 KJ/mol常温下取体积比为4:1的甲烷和氢气的混合气体11.2L(标况),经完全燃烧
化学 燃烧热
以知CH4(g) +2O2(g)=CO2(g)+2H2O(l) ΔH=-Q1 KJ/mol
H2(g)+1/2 O2(g)=H2O(g) ΔH=-1/2Q2 KJ/mol
H2(g)+1/2 O2(g)=H2O(l) ΔH=-1/2Q3 KJ/mol
常温下取体积比为4:1的甲烷和氢气的混合气体11.2L(标况),经完全燃烧后恢复到室温,则放出的热量为
答案为0.4Q1+0.05Q3 请详解
化学 燃烧热以知CH4(g) +2O2(g)=CO2(g)+2H2O(l) ΔH=-Q1 KJ/mol H2(g)+1/2 O2(g)=H2O(g) ΔH=-1/2Q2 KJ/mol H2(g)+1/2 O2(g)=H2O(l) ΔH=-1/2Q3 KJ/mol常温下取体积比为4:1的甲烷和氢气的混合气体11.2L(标况),经完全燃烧
甲烷和氢气的混合气体11.2L
体积比为4:1
甲烷和氢气的体积分别是8.96L和2.24L
物质的量分别是0.4mol和0.1mol
根据热化学方程式:
CH4(g) +2O2(g)=CO2(g)+2H2O(l) ΔH=-Q1 KJ/mol
1molCH4燃烧放热是Q1
0.4mol CH4燃烧放热是0.4Q1
全燃烧后恢复到室温,
水是液态,
热化学方程式是
H2(g)+1/2 O2(g)=H2O(l) ΔH=-1/2Q3 KJ/mol
1molH2燃烧放热是 0.5Q3
0.1mol H2燃烧放热是 0.05Q3
总共放热是 0.4Q1 + 0.05Q3
就是用盖斯定律嘛