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What is the molality of 67.1g of Nano3 in 2.5l of water

i get the molar mass of nano3 and divide it by the 67.1g and multipy it by 2.5l

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Nope. You have it backwards (actually you want the reciprocal of what you wrote).
Its grams/molar mass = mols
Then mols/2.5 = m

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