Mr(H2O) =Ar (H)*2+Ar(O)*1=1*2+16*1=18
Mr(NaCI)=Ar(Na)*1+Ar(CI)*1=23*1+35*1=58
C12H22O11=Ar(C)*12+Ar(H)*22+Ar(O)*11=12*12+1*22+16*11=24+22+176=222
Mr(H2O) =Ar (H)*2+Ar(O)*1=1*2+16*1=18
Mr(NaCI)=Ar(Na)*1+Ar(CI)*1=23*1+35*1=58
C12H22O11=Ar(C)*12+Ar(H)*22+Ar(O)*11=12*12+1*22+16*11=24+22+176=222