4A + 5B = 4C + 6D
34g 80g m 54g m=34g+80g-54g=60g
4x 4*30 6y
34g/4x=60g/120=54g/6y
x=17
y=18
所以选 B.A的相对分子质量是17 D.C,D质量比是10:9 =60g:54g
4A + 5B = 4C + 6D
34g 80g m 54g m=34g+80g-54g=60g
4x 4*30 6y
34g/4x=60g/120=54g/6y
x=17
y=18
所以选 B.A的相对分子质量是17 D.C,D质量比是10:9 =60g:54g