早教吧 育儿知识 作业答案 考试题库 百科 知识分享

把4.6g的纳慢慢地放进10g的水裏,当反应完成后,剩下的溶剂的总质量会是多少?另付上英文原题:4.6gofsodiumareaddedslowlyto10gofwaterinasmalldish.Whatisthetotalmassofthesolutionleftwhenthereactionis

题目详情
把4.6g的纳慢慢地放进10g的水裏,当反应完成后,剩下的溶剂的总质量会是多少?
另付上英文原题:
4.6g of sodium are added slowly to 10g of water in a small dish.What is the total mass of the solution left when the reaction is complete?
▼优质解答
答案和解析
因为4.6g Na与3.6g 水才能完全反应完
设:共有xg水被反应.
2Na+2H2o==2NaOH+H2
46 36
4.6 X
46/4.6=36/X
解得X=3.6
SO 溶剂H2O还剩10-3.6=6.4 g