Answer:
This question cannot be answered as written, as it asks to convert 6.55 mol Na2SO4 to mass of NaOH, but the equation given is for the reaction between NaOH and CaSO4.
Step-by-step explanation:
The equation given in the question (CaSO4 + 2 NaOH -> Na2SO4 + Ca(OH)2) describes a reaction between Calcium Sulfate (CaSO4) and Sodium Hydroxide (NaOH) to form Sodium Sulfate (Na2SO4) and Calcium Hydroxide (Ca(OH)2). However, the question asks to convert 6.55 mol Na2SO4 to the mass of NaOH, which cannot be done using this equation. To answer the question as written, a balanced chemical equation between Na2SO4 and NaOH would be needed.