利用以下各反应热,计算N2H4(l)的标准摩尔生成焓和标准摩尔燃烧热① 2NH3 ( g ) +3N2O ( g ) →4N2( g ) + 3H2O ( l ) △rHm1=﹣1010kj/mol② N2O ( g ) +3H2 ( g ) →N2H4 ( l ) + H20 ( l ) △rHm2=﹣317kj/mol③ 2NH3 ( g
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![利用以下各反应热,计算N2H4(l)的标准摩尔生成焓和标准摩尔燃烧热① 2NH3 ( g ) +3N2O ( g ) →4N2( g ) + 3H2O ( l ) △rHm1=﹣1010kj/mol② N2O ( g ) +3H2 ( g ) →N2H4 ( l ) + H20 ( l ) △rHm2=﹣317kj/mol③ 2NH3 ( g](/uploads/image/z/6374331-27-1.jpg?t=%E5%88%A9%E7%94%A8%E4%BB%A5%E4%B8%8B%E5%90%84%E5%8F%8D%E5%BA%94%E7%83%AD%2C%E8%AE%A1%E7%AE%97N2H4%EF%BC%88l%EF%BC%89%E7%9A%84%E6%A0%87%E5%87%86%E6%91%A9%E5%B0%94%E7%94%9F%E6%88%90%E7%84%93%E5%92%8C%E6%A0%87%E5%87%86%E6%91%A9%E5%B0%94%E7%87%83%E7%83%A7%E7%83%AD%E2%91%A0+2NH3+%28+g+%29+%2B3N2O+%28+g+%29+%E2%86%924N2%28+g+%29+%2B+3H2O+%28+l+%29+%E2%96%B3rHm1%EF%BC%9D%EF%B9%A31010kj%2Fmol%E2%91%A1+N2O+%28+g+%29+%2B3H2+%28+g+%29+%E2%86%92N2H4+%28+l+%29+%2B+H20+%28+l+%29+%E2%96%B3rHm2%EF%BC%9D%EF%B9%A3317kj%2Fmol%E2%91%A2+2NH3+%28+g)
利用以下各反应热,计算N2H4(l)的标准摩尔生成焓和标准摩尔燃烧热① 2NH3 ( g ) +3N2O ( g ) →4N2( g ) + 3H2O ( l ) △rHm1=﹣1010kj/mol② N2O ( g ) +3H2 ( g ) →N2H4 ( l ) + H20 ( l ) △rHm2=﹣317kj/mol③ 2NH3 ( g
利用以下各反应热,计算N2H4(l)的标准摩尔生成焓和标准摩尔燃烧热
① 2NH3 ( g ) +3N2O ( g ) →4N2( g ) + 3H2O ( l ) △rHm1=﹣1010kj/mol
② N2O ( g ) +3H2 ( g ) →N2H4 ( l ) + H20 ( l ) △rHm2=﹣317kj/mol
③ 2NH3 ( g ) + 1/2O2 ( g ) → N2H4 ( l ) +H2O ( l ) △rHm3=-143kj/mol
④ H2 ( g ) + 1/2O2 ( g ) → H2O ( l ) △rHm4=﹣143kj/mol
利用以下各反应热,计算N2H4(l)的标准摩尔生成焓和标准摩尔燃烧热① 2NH3 ( g ) +3N2O ( g ) →4N2( g ) + 3H2O ( l ) △rHm1=﹣1010kj/mol② N2O ( g ) +3H2 ( g ) →N2H4 ( l ) + H20 ( l ) △rHm2=﹣317kj/mol③ 2NH3 ( g
首先要明白其定义:
标准摩尔生成焓:在温度T下,由参考状态的单质生成物质B(计量数为+1)反应的标准摩尔焓变.
因此,要把生成目标产物的反应物变为单质,与目标产物无关的消掉.
3×② -① 得 9H2 ( g )+4N2( g )→3N2H4 ( l )+2NH3 ( g )
③-④ 得 2NH3 ( g ) →N2H4 ( l )+ H2 ( g )
两式相加得 8H2 ( g )+4N2( g )→4N2H4( l );还要除以4,把N2H4 ( l )系数变为+1.
由上,(3×△rHm2-△rHm1)+ (△rHm3- △rHm4);数据自己代入算,算得的结果再除以4,就是标准摩尔生成焓.
标准摩尔燃烧焓:在温度T下,物质B(计量数为-1)完全氧化成相同温度下指定产物时反应的标准摩尔焓变.此处,指定产物应该是N2( g ) 和H20 ( l ) .与上面同理,只是倒过来.
由 3×(② -3×④ )+(③ -① )得4N2( g )+8H2O ( l )→ 4N2H4( l )+4O2( g );到过来写就是4N2H4( l )+4O2( g )→ 4N2( g )+8H2O ( l );只是计算时前面要加负号,结果也要除4.