Molar mass of CaBr2 is the sum of atomic masses of Ca and Br: Mr(CaBr2) = Ar(Ca) + 2Ar(Br) Ar(Ca) = 40 g/mol Ar(Br) = 79.9 g/mol Mr(CaBr2) = 40 + 2 * 79.9 = 199.8 g/mol
The percentage of Br in CaBr2 is: 2Ar(Br) / Mr(CaBr2) * 100 = 2 * 79.9 / 199.8 * 100 = 79.98%
Now make a proportion: x g in 79.98% 335 g in 100% x : 79.98% = 335 g : 100% x = 79.98% * 335 g : 100% x = 267.93 g
