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You need to make a 150mM solution of NaCl (MW = 58).

How much NaCl do you need to make 1L (in moles and in grams)?
If you b need to make 250mL how much NaCl would you need in grams?

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Molarity=(mass/molmass) / volume in liters
massNaCl=Molarity*molmass*volumeinliters

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