(8分) 按要求写热化学方程式:(1)    已知稀溶液中,1 mol H2SO4与NaOH

(8分) 按要求写热化学方程式:

(1)    已知稀溶液中,1 mol H2SO4与NaOH溶液

恰好完全反应时,放出114.6 kJ热量,

写出表示H2SO4与NaOH反应的中和热的热化学方程式

_________________________________________________________________.

(2) 25℃、101 kPa条件下充分燃烧一定量的丁烷气体放出热量为Q kJ,经测定,将生成的CO2通入足量澄清石灰水中产生25 g白色沉淀,写出表示丁烷燃烧热的热化学方程式______________________________________________________.

(3) 已知下列热化学方程式:

①CH3COOH(l)+2O2(g)===2CO2(g)+2H2O(l)  ΔH1=-870.3 kJ/mol

②C(s)+O2(g)===CO2(g) ΔH2=-393.5 kJ/mol

③H2(g)+O2(g)===H2O(l)ΔH3=-285.8 kJ/mol

写出由C(s)、H2(g)和O2(g)化合生成CH3COOH(l)的热化学方程式_________________________________________.

 

答案

(1)H2SO4(aq)+NaOH(aq)===Na2SO4(aq)+H2O(l) ΔH=-57.3 kJ/mol (2分)

(2)C4H10(g)+O2(g)===4CO2(g)+5H2O(l) ΔH=-16QkJ/mol  (2分)

(3)2C(s)+2H2(g)+O2(g)===CH3COOH(l) ΔH=-488.3kJ/mol  (4分)

解析:略

 

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