Question

how many molecules are in a 189g sample of carbon tetra bromide, CBr4?

Answer 1

about 3.4 × 10²³

Explanation:

CBr⁴ 's molar mass is : 331.63 gr/mol

so 189gr of it means : 189/331.63 = 0.56 mol of CBr4

as we know each mole approximately contains

6.022 × 10²³ molecules

0.56 × 6.022 × 10²³ = 3.3723 × 10²³