how many grams of Br are in 105 g CaBr2?

Answer 1

Steps:

Find moles of CaBr₂ in 105 g using molar mass = 199.89 g/mol

Convert to moles of Br

Convert to grams of Br using 79.90 g / mol (atomic mass Br)

(1). molar mass CaBr₂ = 199.89 g / mol

mols CaBr₂ = 105 g x 1 mol / 199.89 g = 0.5253 mols

(2). mols of Br = 0.5253 mol CaBr₂ x 2 mols Br / mol CaBr₂ = 1.051 mols Br

(3). 1.051 mols Br x 79.90 g / mol = 83.97 g Br = 84.0 g Br