Mr(Ca3(PO4)2) = 40*3 + 31 * 2 + 16 * 8 = 310
Mr(H2CO3) = 1*2 + 12 + 16*3 = 62
W(O) = Ar(O) * n / Mr(Ca3(PO4)2) * 100% = 16 * 8 / 310 *100% = 41%
W(O) = Ar(O) * n / Mr(H2CO3) *100% = 16 *3 / 62 *100% = 77%
Mr(Ca3(PO4)2) = 40*3 + 31 * 2 + 16 * 8 = 310
Mr(H2CO3) = 1*2 + 12 + 16*3 = 62
W(O) = Ar(O) * n / Mr(Ca3(PO4)2) * 100% = 16 * 8 / 310 *100% = 41%
W(O) = Ar(O) * n / Mr(H2CO3) *100% = 16 *3 / 62 *100% = 77%
второе вещество молекулярная масса 62, а доля 0,8%