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First you have to find the molar mass of NaOH which is, 23+16+1=40g/mol.

Then you take 0.450M X 200mL=90 mM. which can be converted to .090 moles just move the decimal three decimal places. Then you take you molar mass which is 40g/mol X .090moles= 3.6grams. (The moles cancelled themselves out and your left with grams.) Pretty easy once you practice more problems.

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Q: How many grams of NaOH are required to prepare 200 ml of a 0.450 M solution?
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