Answer
a. 0.213 g KCl.
b. 4.34x$10^3$ g KCl
c. 4.6x$10^-3$ g KCl.
Work Step by Step
Mass percent is the number of grams of solute per 100g of solution.
a. So a solution with a concentration of 1.08% KCl by mass per 100 g of solution.
Hence 19.7 g of solution contains:
(1.08g KCl./100g solution)x 19.7g solution
= 0.213 g KCl.
b. So a solution with a concentration of 18.7% KCl by mass per 100 g of solution.
Hence 23.2 g of solution contains:
(18.7g KCl./100g solution)x 23.2 kg solution
= 4.34x$10^3$ g KCl
c. So a solution with a concentration of 12% KCl by mass per 100 g of solution.
Hence 38 mg of solution contains:
(12 g KCl./100g solution)x 38 mg solution
= 4.6x$10^-3 $ g KCl.
