CH4, Mg3P2, CO, CO2, K3N
1) 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%
2) Mr(Mg(NO3)2) = 24+14*2+16*6=148
W(Mg) = Ar(Mg)*n / Mr(Mg(NO3)2 *100% = 24*1 / 148 *100% =16%
W(N) = Ar(N) * n / Mr(Mg(NO3)2 *100% = 14*2 / 148 *100% =19%
W(O) = Ar(O) *n / Mr(Mg(NO3)2 *100% = 16*6 / 148 *100% =65%