# chemistry

Find the molar masses of the following compounds:

1. LiI
2. PbCO4
3. Mg(OH)2
4. (NH4)3PO4

Find the percent composition (percent by mass) of the given element in the following compounds:

1. Fluorine in AgF
2. Hydrogen in glucose (C6H12O6)
3. Oxygen in Fe2(SO4)3
PART II: CONVERTING BETWEEN GRAMS AND MOLES
Use molar mass as the conversion factor to convert between grams and moles. Remember, in order to go from grams→moles, you divide by the molar mass. In order to go from moles→grams, you multiply by the molar mass.

1. Convert 250 grams of K3PO4 to moles
2. 2 moles of Na3P to grams
3. 95 grams of NaCl to moles
PART III: MOLARITY AND MOLALITY

Type I (Basic Molarity Calculations)
1. 2 moles of NaCl are added to make 230. mL of a solution. What is the molarity of the solution?

2. A solution contains 2.1 moles of HCl and has a molarity of 6.00 M. What volume does the solution occupy?

Type II (Given Grams and Volume, Solving for Molarity):
3. What is the molarity of a solution prepared with 250 grams of KCl and 250 mL of water?

4. What is the molarity of a 3.0 L of solution with 39g of Al(OH)3?

Type III (Given Volume and Molarity, Asked to Solve for Grams):

5. How many grams of LiBr are needed to prepare 3 liters of 3.5M solution?

6. How many grams of CaSO4 are needed to prepare 10.5 L of 3M solution?

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1. A lot of work here. I don't want to just give you the answers but I'll be happy to help you through them. Exactly what do you not understand?

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