Question

(a) Calculate the mass percentage of NaCl in a solution containing 1.50 g of NaCl in 50.0 g of water. (b) A commercial bleaching solution contains 3.62 mass % sodium hypochlorite, NaOCI. What is the mass of NaOCI in a bottle containing 2.50 kg of bleaching solution?

Answer 1

Answer:

a) 2.91%

b) 90.5 grams

Explanation:

Mass percentage is

mass%=$\frac{massofsoluteX100}{massofsolute+massofsolvent}$

a) the mass of NaCl = 1.50g

The mass of water = 50.0 g

Total mass =1.5+50=51.50 g

mass% = $\frac{1.5X100}{50+1.5}=2.91$ %

b) the mass percent of NaOCl = 3.62 %

It means the mass of NaOCl in 100g of bleaching solution  3.62 g

so mass of NaOCl in 2.50kg = 0.0905 kg = 90.5g