Here's how to calculate the moles of sodium sulfate (Na₂SO₄) in 284 g:

1. Find the molar mass of sodium sulfate:

* Na: 22.99 g/mol (x 2 = 45.98 g/mol)

* S: 32.07 g/mol

* O: 16.00 g/mol (x 4 = 64.00 g/mol)

Total molar mass = 45.98 + 32.07 + 64.00 = 142.05 g/mol

2. Use the formula: moles = mass / molar mass

* moles = 284 g / 142.05 g/mol

* moles ≈ 2.00 mol

Therefore, there are approximately 2.00 moles of sodium sulfate in 284 g.