1 the sulfur dioxide present in air is responsible for the

Question

1. The sulfur dioxide present in air is responsible for the "acid rain" phenomenon.  One can calculate its concentration by titrating against a standard permanganate solution as follows:

5 SO₂   +   2 MnO₄^-1   +   2 H₂O   →   5 SO₄^-2   +   2 Mn⁺²   +   4 H⁺

How many grams of SO₂ are present in a sample if 7.37 mL of a 0.00800 M KMnO₄ solution is needed for the titration?  Answer  9.45 x 10^-3 grams

2. Calculate the molarity of (a) 6.57 g of methanol (CH₃OH) in 150. mL of solution and (b) 10.4 g of calcium chloride in 220. mL of solution.  Answers  (a) 1.37 M  (b) 0.426 M

3. Water is added to 25.0 mL of a 0.866 M KNO₃ solution until the final volume is exactly 500. mL. What is the concentration of the final solution?  Answer  0.0433 M

4. A 1.00 mL solution of a radioactive sample exhibiting 1.00 x 10⁹ counts per minute is placed in a tank containing water, and the tank's water is stirred until the radioactivity is completely distributed.  A 1.00 mL sample of the water is then removed and found to exhibit 5.00 x 10² counts per minute.  What is the volume of the water in liters?  Answer 2000 liters

5. Calculate the volume of 0.150 M HCl needed to completely neutralize 25.00 mL of 0.125 M NaOH.  Answer  20.8 mL