How many grams of Na₂SO₄ are needed to completely precipitate the Ba²⁺ ions as BaSO₄ from 150 mL solution of 0.150 M BaCl₂ according to the balanced chemical reaction:

Na₂SO₄(aq) + BaCl₂(aq) → BaSO₄(s) + 2 NaCl(aq)

How do i start? which is my starting point and I need help with the conversion ratios to complete the boxes