Объяснение:
Mr(CaO) = 40+16=56
W(Ca) = Ar(Ca) *n / Mr(CaO) *100% = 40*1 / 56 *100% =71%
W(O) = Ar(O) *n / Mr(CaO) *100% = 16*1 / 56 *100% = 29%
Mr(CCl4) = 12+35,5*4 =154
W(C) = Ar(C) *n / Mr(CCl4) *100% = 12*1 / 154 *100% = 8%
W(Cl) = Ar(Cl) *n / Mr(CCl4) *100% = 35,5*4 / 154 *100% = 92%
