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A solution contains $0.5$ mol NaCl in $2$ L of solution. Its molarity is:

A$1$ M, equal to the moles of salt alone on the shelf
B$2$ M, equal to the litres of solution in the jar here
C$0.5$ M, equal to the moles of salt regardless of volume
D$0.25$ M, since $M = 0.5\text{ mol}/2\text{ L} = 0.25$
Answer & Solution
Correct answer: D. $0.25$ M, since $M = 0.5\text{ mol}/2\text{ L} = 0.25$
$M = 0.5\,\text{mol}/2\,\text{L} = 0.25$ M.
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