Diketahui Ar C = 12, Ar H = 1 dan Ar O = 16, MrC2H4O2....

mr C2H4O2 = 2× ar c+ 4× ar H+ 2 × ar O
= 2× 12 + 4×1 + 2×16
= 60

Ar C = 12
Ar H = 1
Ar O = 16
Mr C2H4O2 = .....?

Mr C2H4O2 = (2 x Ar C) + (4 x Ar H) + (2 x Ar O)
= (2 x 12) + (4 x 1) + (2 x 16)
= 24 + 4 + 32
= 60