W1(KNO3)=15%
m(KNO3)=700*0.15=105г
w2(KNO3)=105/300/100%=35%
n (PbSO4) = 0,55 моль
M (PbSO4) = 303 г/моль
m (PbSO4) = n * M = 0,55 * 303 = 166,65 г
2Сa + O2 -> 2CaO
CaO + H2O -> Ca(OH)2
Ca(OH)2 + 2HNO3 -> Ca(NO3)2 + 2H2O
Ca(NO3)2 + H2SO4 -> CaSO4 + 2HNO3
Ca(+2) + 2NO3(-)+ 2H(+) + SO4(-2) -> CaSO4 + 2H(+) + 2NO3(-)
Ca(+2) + SO4(-2) -> CaSO4