Question

1.6 × 10−3 mol Na2SO4.

Answer 1

Molar mass of Na = 23 g

Molar mass of S = 32 g

Molar mass of O = 16 g

So, molar mass of  $N a 2 S O 4 Na_2SO_4 = (2× 23 )+ 32 + (4×16)g = 142 g$

Mass = $1.6×10^{-3}×142=0.2272grams$