(SOMEONE ELSE'S ANSWER TO THE SAME QUESTION I FOUND I HOPE THIS HELPS!) Given:
mass of Na₂SO₄ = 25.0 g
Required:
moles of Na
number of Na particles
Solution: (moles of Na)
Step 1: Calculate the molar mass of Na₂SO₄.
molar mass of Na₂SO₄ = (22.99 g/mol × 2) + (32.07 g/mol × 1) + (16.00 g/mol × 4)
molar mass of Na₂SO₄ = 142.05 g/mol
Step 2: Calculate the number of moles of Na by using dimensional analysis.
Since there are 2 mol of Na in 1 mol of Na₂SO₄, the number of moles of Na is
Solution: (number of Na particles)