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Molarity

The number of...

Question

The number of moles of sodium carbonate (Na₂CO₃) present in 10 L of 2 M solution is .

A

20

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B

2

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C

10

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Solution

The correct option is A 20
Molarity is defined as number of moles of solute present per litre of solution.

Given, M = 2 $m o l L^{- 1}$
Volume of solution = 10 L

$M$ = $\frac{N u m b e r o f m o l e s o f s o l u t e}{V o l u m e o f s o l u t i o n i n l i t r e s}$

${2 mol L}^{- 1}$ = $\frac{N u m b e r o f m o l e s o f s o l u t e}{10 L}$
Number of moles = 2 $m o l L^{- 1}$ x 10 L
= 20 moles

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