Question

How many moles of sodium hydroxide are contained in 65.0 mL of a 2.20 M solution?

Answer 1

2.20 M means there are 2,20 mol of NaOH in 1 000 mL of solution. We can use this proportion as a conversion factor:

$65\ mL\cdot \frac{2.20\ mol}{1\ 000\ mL} = \bf 0.143\ mol$