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Question

What will be the molarity of a solution containing 5 g of sodium hydroxide in 250 mL of water?

A
0.5 M
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B
1.0 M
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C
2.0 M
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D
0.1 M
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Solution

The correct option is A 0.5 M
molar mass of NaOH = 40 g/mol
Number of moles = 540 = 0.125 mol
Molarity M = number of molesVolume of the solution( mL)×1000
M = 0.125250×1000 = 0.5 M

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