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Question:

How many moles are contained in 0.455 L of a 7.182 M solution?

A 3.268 moles
Explaination

You would find the number of moles by using the molarity formula: molarity = moles of solute per\u00A0liter of solution. Thus:
0.455 L x (7.182 M \u00F7\u00A01.0 L) = 3.268 moles