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SAT II Chemistry Exam Prep

Category - Multiple Choice

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How many grams of solid NaOH are needed to make 1.20 liters of a 1.75 M solution?

84.0 grams
2.10 grams
.686 grams
21.0 grams
24.4 grams

Explanation

Answer: 84.0 grams

Molarity is expressed as (moles of solute) / (liters of solvent). In this question, the simple equation 1.75 = x / 1.20 indicates that 2.1 moles of NaOH are required. Multiplying this value by the molar mass of NaOH gives the final answer, 84.0 grams.

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