What is the molar mass of BaBr2?

297.135 g/mol

Explanation:

The molar mass is calculated by adding up the relative atomic masses of all the different species and multiplying them by the quantity of each. Let's start by recording the relative atomic masses of each species.

One barium atoms = 1 * 137.327 = 137.327

Two Bromine atoms = 2 * 79.904 = 159.808

Total = 297.135

Molar mass = 297.135 g/mol (take note that the molar mass unlike the relative atomic mass has units)

The answer is 297.14 g/mol