Question

A compound with an empirical formula of C 2H 4Br has a molar mass of 215.90 g/mol. What is the molecular formula?

Answer 1

C2 H4 Br ?
C = 12 grams / mol
H = 1 gram / mol
Br = 80 grams / mol
x * (24 + 4 + 80) = 216
x * 108 = 216
x= 2
so
C4 H8 Br2