Part 1: How do you make 500mL of 1M NaCl?
Part 2: How do you make 250 mL of 5M NaCl?

Part 1:  0.5 mol

Part 2:  0.25 mol

Explanation:

For both problems, use the equation M = (moles of solute)/(liters of solvent).  

For part one, 1 M = (mol)/(0.5 L) = 0.5 mol.

For part two, 5 M = (mol)/(0.25 L) = 1.25 mol

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