1/25 Answers to Mole Homework

Page 1

1. 8 atoms Cu

2. 7.28 mol Cu

3. 112 atoms S

4. 4.62 x 10^5 mol S8

5. 4.9 x 10^25 atoms O

Note for #5: It is asking for the number of O atoms in 41 moles of O2. Remember that for every mole of O2, there are 2 moles of O because there are 2 O atoms in a single O2 molecule.

Page 2

6. 4.0 x 10^25 molecules O2

7. 178 atoms Cl

8. 5.63 x 10^8 mol Cl2

9. 9.78 x 10^41 mol I2

Note for #7: It's a lot like #1... draw it out if you have to.

Note for #8: Remember, there are 2 moles of Cl in 1 mole of Cl2 because for every Cl2 molecule there are 2 atoms of Cl. If you have 10 Cl atoms, there are 5 Cl2 molecules (half of 10).

Page 3

26.98 g/mol Al

118.7 g/mol Sn

83.80 g/mol Kr

12.01 g/mol C

28.00 g/mol N2

159.8 g/mol Br2

32.00 g/mol O2

253.8 g/mol I2

78.9 g/mol CaCl2

16.01 g/mol CH4

146 g/mol SF6

153.8 g/mol CCl4

342 g/mol C12H22O11

310.2 g/mol Ca3(PO4)2

Page 4

0.28 mol Br2

0.0057 mol CO2

0.0432 mol SF6

7.2 g CH4

240 g S8

960 g CaCO3

Good luck! Email me if you have any questions (I'll reply if it's before 10pm)

-Miss Hong (shong@u.northwestern.edu)