Molarity of solution, Help me to go through this problem. When 7.1gm Na 2 SO 4

Molarity of solution

Help me to go through this problem. When 7.1gm Na₂SO₄ (molecular mass 142) dissolves in 100ml H₂O , the molarity of the solution is: (a) 2.0 M (b) 1.0 M (c) 0.5 M (d) 0.05 M

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