Molar Mass of a Compound

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					Molar Mass of a Compound (and some conversions….)
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Finding the molar mass of a compound:

To find the molar mass of a compound, identify the molar mass of each element in the
compound and multiply by the number of atoms present. Add up the totals for all the
elements in the formula.

Example:      NH4ClO3

N = 1 atom x 14.0g = 14.0
H = 4 atoms x 1.0g = 4.0
Cl = 1 atom x 35.5g = 35.5
O = 3 atoms x 16.0g = 48.0
Total molar mass = 101.5g

   1. Find the molar mass of Mg(OH)2 (4 pts) Show your work!




   2. Find the molar mass of C6H12O6 (4 pts) Show all work.




   3. Find the molar mass of Al(C2H3O2)3 (5 pts) Show all work.




   4. Find the molar mass of CO2 (3 pts) Show all work.
5. How many moles of Mg(OH)2 do you have if you have 29.0 grams of it? (2 pts)
   Show your work.




6. How many molecules of C6H12O6 are there in 360 grams? (The amount found in
   10 servings of soda). (3 pts – show your work).




7. If you have 1.806 x 1024 formula units of Al(C2H3O2)3 how many grams is that?
   (3 pts – show your work)




8. If you start with 66 grams of CO2, and you want to fill up 10 balloons (each holds
   1.5 liters), do you have enough CO2 to do that job? (4 pts) Show your work!




9. How many balloons (total) could you fill up with 66 grams of CO2 (if each
   balloon only holds 1.5 liters)? (2 pts)

				
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