Problem Set

1. If you are performing a reaction that requires 0.087 moles of K2SO3 and you have a stock solution of K2SO3 that contains 3.179 grams/liter. How many ml of stock solution should you use? (number that are used with the letters are small)

2. A 7.35 g of chromium is reacted with an excess of oxygen to make 10.74 of chromium oxide. What is the simplest formula foe the chromium oxide

3.        A solution of sodium hydroxide is standardized by titrating a pure sample of potassium acid phthalate (KHP) which has one acidic proton and a molecular weight of 204.22 g/mole. If it takes 20.46 ml of NaOH to titrate a 0.1080 g sample of KHP, what is the molarity of the sodium hydroxide??

4. What is the wavelength of light emitted from a hydrogen atom when an electron changes energy level from n=3  to n = 2   ??