What is the mass of 0.150 mole of Na2SO4?

To find the mass of 0.150 moles of Na₂SO₄ (sodium sulfate), first calculate its molar mass. The molar mass of Na₂SO₄ is approximately 142.04 g/mol (sodium = 22.99 g/mol × 2, sulfur = 32.07 g/mol, oxygen = 16.00 g/mol × 4). Therefore, the mass of 0.150 moles is calculated as follows: 0.150 moles × 142.04 g/mol = 21.31 grams. Thus, the mass of 0.150 moles of Na₂SO₄ is approximately 21.31 grams.