Determine the volume of 0.100 mol of HCl in 0.250\ {moldm}³ of solution.

Correct Answer is : 400 cm3400\ {cm}³400 cm3

Correct Answer is : 400 cm3400\ {cm}³400 cm3

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WAEC Chemistry 2023 Paper

Question : 34

Total: 50

0.250\ \mathrm{moldm}^3

Solution:

Concept:

Volume is calculated from amount of solute and its concentration using

V = \frac{n}{C}

Explanation:

Given amount of HCl,

n = 0.100\ \mathrm{mol}

Given concentration of solution,

C = 0.250\ \mathrm{mol}\ \mathrm{dm}^{-3}

Use the formula:

V = \frac{n}{C}

Substitute the values:

V = \frac{0.100\ \mathrm{mol}}{0.250\ \mathrm{mol}\ \mathrm{dm}^{-3}} = 0.4\ \mathrm{dm}^3

Convert

\mathrm{dm}^3

\mathrm{cm}^3

using

1\ \mathrm{dm}^3 = 1000\ \mathrm{cm}^3

Thus,

V = 0.4\ \mathrm{dm}^3 \times 1000\ \mathrm{cm}^3\ \mathrm{dm}^{-3} = 400\ \mathrm{cm}^3

Answer:

400\ \mathrm{cm}^3

(Option D)

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