Question

Find the weight of calcium present in 0.2 M of 2 litres calcium sulphate solution:

• A. $10$
• B. $15$
• C. $13.6$
• D. $16$

Answer 1

Answer: (D)

$16$

In 1 L of solution we have 0.2 mole of calcium sulphate

in 2 L solution we have 0.4 moles of calcium sulphate

mass of 1 mole of calcium sulphate = 136

mass of calcium in 1 mole of calcium sulphate = 40

mass of 0.4 mole of calcium in calcium sulphate = $40\times 0.4=16$
Option D is correct.