2.  You can only work with your partner  All your work must be shown on the white board  First team gets 3 points  Second team gets 2 points  Third team gets 1 point Team with the highest score gets bubble gum!

3. Determine the molar mass for the following: CH 3

4. Determine the molar mass for the following: Pb(NO 3 ) 2

5. Calculate the number of moles of 26.2 g of gold.

6. Calculate the number of moles of 41.5 g of calcium.

7.  Calculate the mass of 3 moles of Fe?

8.  Calculate the number of grams of 7.5mol of Pb.

9.  What is the volume of 3 moles of Cl 2 ?

10.  How many moles of 42L of CH 4 ?

11.  How many molecules are in 5.3 moles of H 2 C 2 O 4 ?

12.  How many moles is 7.8x10 23 atoms of Cu?

13.  Calculate the percent composition of copper in CuBr 2

14.  Calculate the percent composition of carbon in C 6 H 10 O 6

15.  Determine the empirical formula of a compound that has the following percent compositions: Na 83.12%, N 16.88%

16.  Determine the empirical formula of a compound that has the following percent compositions: 65.02 % Pt, 2.02% H, 9.34% N, 23.63% Cl.

17.  How many grams CHCl 3 is will be produced from 50.0 g CH 4 ? CH 4 + 3 Cl 2  CHCl 3 + 3 HCl  What will the percent yield be if the actual yield is 400g?

18.  What mass in grams of sodium carbonate, Na 2 CO 3 is produced if 50.0 g of sodium oxide, Na 2 O, are reacted with excess carbon monoxide, CO, according to the fol­lowing chemical equation? 2Na 2 O (s) + CO (g)  Na 2 CO 3(s) + 2 Na (s)

19.  The reaction between solid sodium and iron III oxide is one in a series of reactions that inflates an automobile airbag. Na + Fe 2 O 3 → Na 2 O + Fe  If 100.0 g Na and 100 g of Fe 2 O 3 are used in this reaction determine the limiting reactant and the mass of iron produced.