(1)反应生成氯化钠、醋酸,离子反应为CH3COO-+H+=CH3COOH,故答案为:CH3COO-+H+=CH3COOH;
(2)碳酸氢钠完全反应,生成碳酸钙、水、NaOH,离子反应为OH-+HCO3-+Ca2+=CaCO3↓+H2O,
故答案为:OH-+HCO3-+Ca2+=CaCO3↓+H2O;
(3)3molNO2反应放出138kJ热量,△H=-138 kJ/mol,则热化学方程式为3NO2(g)+H2O(l)=2HNO3(aq)+NO(g)△H=-138 kJ/mol,
故答案为:3NO2(g)+H2O(l)=2HNO3(aq)+NO(g)△H=-138 kJ/mol;
(4)1mol液态水汽化时需要吸收44kJ热量,①H2O(l)=H2O(g)△H=44KJ/mol;4g甲烷完全燃烧生成二氧化碳气体和水蒸气放出的热量为200.5kJ,则②CH4 (g)+2O2(g)→CO2 (g)+2H2O(g)△H=-802kJ/mol,由盖斯定律可知,②-①×2可得CH4 (g)+2O2(g)→CO2 (g)+2H2O(l)△H=-802kJ/mol-88kJ/mol=-890.0 kJ/mol,即甲烷的燃烧热为△H=-890.0 kJ/mol,故答案为:△H=-890.0 kJ/mol;
(5)由PCl3(g)和Cl2(g)生成1molPCl5(g)放出热量93kJ,反之,1molPCl5分解吸收93kJ的热量,则PCl5分解的热化学反应方程式为PCl5(g)=PCl3(g)+Cl2(g)△H=+93kJ/mol,
故答案为:PCl5(g)=PCl3(g)+Cl2(g)△H=+93kJ/mol.