Question

What mass of crystalline calcium chloride
needs to be dissolved in water for
preparation of 300 g of 11.1% solution?
1)33.3g
2)27g
3)3330g

Answer 1

Answer:

1) 33.3g is the correct answer

Answer 2

Answer:

        Molar mass of Cacl2=111 g

        ca-40.08 g,cl2=111 g

       11.1% solution means,

             11.1 g cacl2 present in 100g solution

                   1 g sol =11.1÷ 100×1

                              =0.111 g

             300 g sol= 11.1×300÷100

                             =33.3 g

∴33.3 g  of crystalline calcium needs to dissolved in water for the preparation of 300 g of 11.1% solution.