1.M(Fe)=56g/mol
M(Li)=7
M(H2)=2
M(Cl2)=71
M(CO)28
M(CO2)=44
M(HNO3)=63g/mol
2. m=n·M=162.5g
3. n=m÷M=25÷60=0.36mol
4.M(CH4)=16g/mol
n=16÷44=0.36mol
5.M (CH3COO)2Mg=142g/mol
wC=24÷142·100%=16.9%
wO=32÷142·100%=22.5%
wH=3÷142·100%=2%
wMg=24÷142·100%=16.9%