(热值指在一定条件下每克物质完全燃烧所放出的热量,燃烧产物在

(热值指在一定条件下每克物质完全燃烧所放出的热量,燃烧产物在该条件下是一种较为稳定的状态),下表是几种物质在常温常压下的热值数据。

物质

H2

CO

CH4

热值/kJ·g–1

143

10

56

1)根据以上热值数据,最理想的燃料是                       

2)根据以上热值数据,写出在该状态下表达氢气燃烧热的热化学方程式                   

3)若管道煤气(含体积比为1:1H2CO)价格为1.00/m3,天然气的价格为2.50/m3,使用哪种气体在经济上更为合算?          理由是       。(无需写出计算过程)

答案

1H2   2 H2(g)+1/2O2(g)=H2O(l) H-286kJ·mol1

3)天然气,相同价格的管道煤气和天然气相比产生的热量后者多

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