Объяснение:
1) CaS, Fe2S3, Na2S, Al2S3
2) Mr(PH3) = 31 + 1*3 = 34
W(P) = Ar(P) *n / Mr(PH3) *100% = 31*1 / 34 *100% = 91%
W(H) = Ar(H) *n / Mr(PH3) *100% = 1*3 / 34 *100% = 9%
3) 12: 16*2 = 12:32 = 3: 8
Объяснение:
1) CaS, Fe2S3, Na2S, Al2S3
2) Mr(PH3) = 31 + 1*3 = 34
W(P) = Ar(P) *n / Mr(PH3) *100% = 31*1 / 34 *100% = 91%
W(H) = Ar(H) *n / Mr(PH3) *100% = 1*3 / 34 *100% = 9%
3) 12: 16*2 = 12:32 = 3: 8