Question

# What will be the molarity of a solution which contains $$5.85\; g$$ of $$NaCl(s)$$ per $$500$$ ml?

A
4molL1
B
20molL1
C
0.2molL1
D
2molL1

Solution

## The correct option is C $$\displaystyle 0.2\: mol \:L^{-1}$$The expression for the molarity of the solution is: $$Molarity = \dfrac {\text {Mass of NaCl}}{\text {Molar mass of NaCl} \times \text {Volume of NaCl solution} (in\; L)}$$Substituting values in the above expression, we get-$$Molarity = \dfrac {5.85} {58.5 \times 0.5} = \displaystyle 0.2\: mol \:L^{-1}$$Hence, option C is correct.Chemistry

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