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This question determines the students ability to understand the relationship between moles and concentration.

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The formula mass of NaOH is 40 g/mol. That is, 40 g of NaOH dissolved into 1000ml (1 litre) of solvent will give a 1 Molar solution (1 M). We need only {vol} mL ({decimal(vol/1000)} L) at {molar} M so 40 x {decimal(vol/1000)} L x {molar} M = {correct} g.

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How many grams of NaOH would you need to make {vol} mL of a {molar} M solution, given the molecular weight of NaOH is 40 g/mol?

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Never seen before.

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