calculating and using molar mass of diatomic elements

Question

A chemist measures the amount of bromine liquid produced during an experiment. She finds that 2.87 g

 of bromine liquid is produced. Calculate the number of moles of bromine liquid produced.

Round your answer to 3 significant digits.

Answer 1

Bromine liquid is Br₂(l).

The molar mass of Br₂ = 159.8 g / mole

2.87 g Br₂ x 1 mol Br₂ / 159.8 g = 0.01796 moles = 0.0180 moles Br₂ (3 sig. figs.)