1)Mr(CH4)=12+1*4=16
W(C)=12/16*100%=75%
W(H)=4/16*100%=25%
2)Mr(CaC2)=40+12*2=64
W(Ca)=40/64*100%=63%
W(C)=(12*2)/64*100%=37%
3)Mr(CaCO3)=40+12+16*3=100
W(Ca)=40/100*100%=40%
W(C)12/100*100%+12%
W(O)=(16*3)/100*100%=48%
1)Mr(CH4)=12+1*4=16
W(C)=12/16*100%=75%
W(H)=4/16*100%=25%
2)Mr(CaC2)=40+12*2=64
W(Ca)=40/64*100%=63%
W(C)=(12*2)/64*100%=37%
3)Mr(CaCO3)=40+12+16*3=100
W(Ca)=40/100*100%=40%
W(C)12/100*100%+12%
W(O)=(16*3)/100*100%=48%