Question

2.3 moles of CaBr2 contains how many molecules

Answer 1

Avogadro's law states that in every mole of a substance, there are $6.022 \times 10^{23}$ molecules.

This means that in 2.3 moles, there are $2.3(6.022 \times 10^{23})=\boxed{1.4 \times 10^{24} \text{ (to 2 sf)}}$