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How much 2.5mM solution of NaCl can be made from 30g of this pure salt?

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Molar mass NaCl = 58.442
30.0 g is 30.0/58.442 = 0.5133 moles.
2.5 mM = 0.0025M
M = moles/L of soln.
0.0025 = 0.5133/L of soln
Solve for L.

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