First slide

Atoms; molecules and matter

Question

Which of the following solutions contains same molar concentration?

Moderate

A

166 g .K I per litre of solution
B

$33.0 g {({NH}_{4})}_{2} {SO}_{4} in 200 mL solution$
C

$25.0 g {CuSO}_{4} . 5 H_{2} O in 100 mL solution$
D

$27 . 0 mg {Al}^{3 +} per mL solution .$

Solution

$[\begin{array}{l} Mw of KI, {({NH}_{4})}_{2} {SO}_{4}, {CuSO}_{4} \cdot 5 H_{2} O and \\ {Al}^{3 +}, respectively, are, 166, 132, 250, and \\ 27 g {mol}^{- 1} . \end{array}]$
$\begin{array}{l} 1 . M = \frac{166 \times 1000}{166 \times 1000} = 1 .0 M \\ 2 . M = \frac{33 \times 1000}{132 \times 200} = 1 .25 M \\ 3 . M = \frac{25 \times 1000}{250 \times 100} = 1 .0 M \\ 4 . M = \frac{27 \times 10^{- 3} \times 1000}{27 \times 1} = 1 .0 M \end{array}$

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