由反应方程式可知:n(CH2=CH2):n(Br2)=1:1n(CH2=CH2)=0.672L/22.4L/mol =0.03moln(Br2)=0.03molm(Br2)=0.03mol*80g/mol=2.4gm(溴水)=2.4g/2%=120g