# Chemistry: Percent Concentration Problems

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1. Percent Concentration as a Conversion Factor

How many grams (m) of glucose are in 265 mL of a 5.50% (m/v) glucose solution?

Express your answer numerically in grams.

Part C

You have a solution that is 18.5% (v/v) methyl alcohol. If the bottle contains 1.64 L of solution, what is the volume ( ) in milliliters of methyl alcohol? Express your answer numerically in milliliters.

Part D

A 6.00 % (m/v) solution contains 25.6 g of NaCl. What is the total volume (V) of the solution in milliliters?

Express your answer numerically in milliliters.

What is the final volume in milliliters when 0.833 L of a 44.8 % (m/v) solution is diluted to 25.0 (m/v)?

Express your answer numerically in milliliters.

Problem 8.44

Part C

A 502 mL NaCl solution is diluted to a volume of 1.39 L and a concentration of 7.00 M. What was the initial concentration?

Express your answer numerically in molarity.

A bottle of champagne is 12% alcohol by volume. If there are 790 ml of champagne in the bottle, how many milliliters of alcohol are present? Express your answer using two significant figures.

A patient receives 250 ml of a 3.0% (m/v) amino acid solution twice a day. How many grams of amino acids are in 250 ml of solution? Express your answer using two significant figures.

Part B

How many grams of amino acids does the patient receive in 1 day?

Express yor answer using two significant figures.

If a large piece of dirt, say 10mg, falls into the dish just before the sample is weighed the second time, what effect would this have on the weight of dissolved solids found? Would you expect the concentration of the residue to be higher or lowe than the true value?

If a large amount of water splatters out of the beaker during the evaporation process. How would this affect the final result? Would you expect the concentration of the residue to be higher or lower than the true value

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