How do you calculate the number of moles from molarity and volume?

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How do you calculate the number of moles from molarity and volume?

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Answer 1 · 2014-01-08T17:34:21

You multiply the molarity by the volume in litres.

Explanation:

Molarity is the number of moles of a substance in one litre of solution. The official symbol for molarity is “c” (concentration), but many people use the old symbol “M”.

$M = \frac{n}{V}$ $M = n/V$ , where $n$ $n$ is the number of moles and $V$ $V$ is the volume in litres.

We can rearrange this equation to get the number of moles:

$n = M \times V$ $n = M × V$

Example
:
How many moles of $NaCl$ $"NaCl"$ are contained in 0.300 L of 0.400 mol/L $NaCl$ $"NaCl"$ solution?

Solution:

$n = 0.300 color(red)(cancel(color(black)("L soln"))) × "0.400 mol NaCl"/(1 color(red)(cancel(color(black)("L soln")))) = "0.120 mol NaCl"$

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How do you calculate the number of moles from molarity and volume?

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