Magnesium chloride help....asap please?

Question

1) 9.52g of magnesium chloride is dissolved in 250.0ml of water
i)Determine the concentration of the solution.
ii) To prepare a 1.00molL-1 solutin of magnesium chloride, so determine the mass of MgCl2 needed to prepare 500.0ml of the solution

Thanks heaps

Answer 1

All you need is to find out the molecular weight of MgCl2.
1) 9.52/mol wt x 4 = xxx moles/liter (Molar)

2) To prepare 1 M solution, dissolve the gm mol weight of MgCl2 in liter of water. For 500 ml, you need only half that amount.