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1. First, remember definition of M (moles), M = moles of species / L.

0.33 M = 0.33 moles HCl / L

2. Then, multiple your volume by the molar concentration:

0.33 moles HCl / L x 0.70 L = 0.231 moles HCl or you can say n=CONCENTRATION multiply by VOLUME(HCl) which gives 2310 mol HCl

It's helpful to carry the units with your calculations. That way you can check that numerators and denominators cancel to give you the units of your answer.

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