Ответ: Ca(NO3)2 — нитрат кальцияw% (Ca) = Ar/Mr*100% = 40/164*100% = 24.4%w% (N) = Ar/Mr*100% = 28/164*100% = 17.1%w% (O) = Ar/Mr*100% = 96/164*100% = 58.5%