How many moles of particles would 3 mol Sodium sulfate give in solution?

Answer 1

9 moles of particles.
When a salt like sodium sulfate dissolves, it's ions separate. that leads to 2 moles of sodium ions and one mole of sulfate ion when a mole of sodium sulfate dissolves. Since there are 3 moles of sodium sulfate, and 3 particles for every mole, there would be 9 moles of particles in the solution.