Question

1. What is the mass of 4 moles of aluminium.

2. How many number of particles are there is 45 g of ϕ sodium.

3. How many number of moles are there is 2 grams of aluminium. Atomic mass 27

Answer 1

1. Molar mass of Aluminium = 26.98 g/mol.

Mass of 4 moles = 4 $\times$ 26.98 = 107.92 g

2. Number of moles in 46 g of sodium = $\frac{46}{22.98}=2.001moles$
Number of atoms in 2.001 moles of sodium = 2.001 $\times$ 6.022 $\times$ 10²³ = 12.05 $\times$ 10²³.

3. Number of moles of Aluminium = $\frac{1}{26.98}=0.037g/mol.$