Mg+ 2HCl === MgCl2 + H2↑
24 95 2
2.4g x y
24/2.4g=95/x=2/y
x=9.5g
y=0.2g
所得溶液中溶质的质量分数是 9.5g/(2.4g+68g-0.2g)*100%=13.5%