1. calculate the molarity when 5.0 g kbr is dissolved to make 0.500 l solution. round to two significant digits.

2. how many ml of isopropyl alcohol are needed to prepare 125 ml of 4.0% isopropyl alcohol solution (by volume/volume)?

3. how many grams of glucose are needed to prepare 300 ml of a 5.0% glucose solution (by mass/volume) ?

4. how many grams of sodium chloride are needed to prepare 750 g of a 0.90% sodium chloride solution (by mass/mass)? round to three significant digits.

5. a teaspoon of salt has a mass of approximately 8.0 g. if this quantity is added to a swimming pool that is 25 meters long and 15 meters wide, with a average of 2.0 meters deep, how many parts per million of salt have been added to the contents of the pool? assume that the density of water in the pool is 1.00 g/ml. round to two significant digits. [hint 1m3=1000l].

6. a car is tested for tail pipe emissions. a 8-kg sample of exhaust was collected. the sample contained 8 grams of carbon monoxide and 198 mg of unburned hydrocarbons. how many parts per million of unburned hydrocarbons were found in the exhaust. round to three significant digits.

7. to what volume should 5.0 ml of an 2.0 m citric acid solution be diluted in order to obtain a final solution that is 1.50 m? round to two significant digits.

8. what is the morality of a solution of sodium chloride prepared by diluting 750.0 ml of a 6.0 m sodium chloride solution to 2.0 l? round to three significant digits.