题型:填空题 — Where did you get such a beautiful skirt? — It was at the department store _____we used to shop.A. that B. there C. whereD. which 查看答案
题型:填空题 (4分)已知1mol H2燃烧生成液态水放出热量为285.8kJ,C2H4、C2H6各1mol分别燃烧生成液态水和CO2,放出热量分别为1409.5kJ、1558kJ。试写出C2H4生成C2H6的热化学方程式 。 查看答案