345 g suvda 57,4 g ZnS04-7H20 ning eritilishidan hosil bolgan eritmada

51. (03-11-52) 345 g suvda 57,4 g ZnS04-7H20 ning eritilishidan hosil bolgan eritmadagi rux sulfatning massa ulushini 4% gacha kamaytirish uchun eritmaga qancha (g.) suv qoshish kerak? Рђ) 400,5 Р’) 250,8 РЎ) 397,6
D) 402,6 Р•) 405,0