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Question

What is the molarity of a solution containing 10g of NaOH in 500 mL of the solution?

A
0.25 mol L1
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B
0.75 mol L1
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C
0.5 mol L1
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D
1.25 mol L1
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Solution

The correct option is C 0.5 mol L1
Molarity = n×1000Vml

Molar mass of NaOH = 40g/mol

No of moles of NaOH = 1040=0.25mol

therefore Molarity = 0.25×1000500=250500=0.5molL1

Hence, the correct option is C

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