Chemistry Question? Help pleas!

Posted on 2014-12-18 07:55:00 in Chemistry by DICK

Multiple Choice

1. How many moles of glucose are in 243 mL of 2.55 M glucose solution?



a. 0.620 mol

b. 0.0620 mol

c. 6.20 mol



2. What is the molality of a KNO? solution containing 75.0 g of solute added to 750 mL of water?





a. 1.00 m

b. 0.989 m

c. 0.989 M



3. Vodka is made up of 40% alcohol by volume. How much water is in a 30 mL sample of vodka?



a. 12 mL

b. 16 mL

c. 28 mL



4. A copper (II) sulfate solution is prepared by dissolving 12.0 g CuSO? in 100 mL of water. What is the weight percent of copper sulfate in this solution?





a. 10.7 %

b. 12.0%

c. 7.51%



5. A sample of drinking water is shown to have 2.0 x 10?? mg HCN (hydrogen cyanide) per gram of water. What is this value in parts per million?



a. 0.2 ppm

b. 20 ppm

c, 2 ppm

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