Question

How many moles of Na2CO3 are there in 10.0L of 3.00 M solution

Answer 1

Step 1 - Revising the definition of molar concentration (M)

The molar concentration (M) may be defined as:

$M=\frac{n}{V}$

In this equation, n corresponds to the number of moles of solute, whereas V stands for the total volume of the solution.

If we already know the concentration, we can find the number of moles contained in a given volume.

Step 2 - Finding the number of moles

The exercise says the concentration is 3 M and the volume is 10L. Setting these values in the equation:

$3=\frac{n}{10}$

Now, we can find the number of moles n:

$n=3\times10=30\text{ moles}$

Answer: there are 30 moles of Na2CO3 in 10L of this solution.