Răspunsuri

2014-09-27T21:49:12+03:00
2HCl+Zn=ZnCl2+H2

36,5/100×20=7,3g HCl pur
2×36,5 g HCl.......2 g H
7,3 g HCl............xg H
=> =x0,2 g H
1 2 1