Solve the following problems. Be sure to use the correct units. SHOW ALL WORK. No credit will be given for answers without work.

1. How many moles are in each of the following:

1. 3.445 x 1022 mc of ammonium hypobromite

b) 3.445 g of barium bidichromate

2. How many molecules are in each of the following:

1. 5.887998 x 10-2 g of bromine

b) 58.811 moles of sulfur dioxide

3. Your younger brother is complaining that his helium balloon is too heavy. (Don't ask me why, its not my brother!) You determine that the balloon contains 3.2254 x 1022 atoms of helium. How much does the helium in the balloon weigh?

4. A compound is made of hydrogen and carbon. If the compound is 10.00% hydrogen by mass and the GMM of the compound is approximately 80 g/mol, what are the empirical and molecular formulas for the compound?

 5. How many moles of barium chloride can be found in 37.2 mL of a 1.96 M solution?

 6. How many grams of ammonium nitrate are required to make 525 mL of a 0.64 M solution?

 7. How many mL of a 2.54 M solution contain 3.81 x 10²² molecules of silver nitrate?