Calculate the answer to each of the following problems.  Remember to use correct significant figures and units.  Use the atomic masses given in the periodic table in your text book.

#1:   Calculate the molar mass of SF6.

  128.07 g/mole
  51.1 g/mole
  51.07 g/mole
  146.07 g/mole
  146 g/mole


 #2:   Calculate the molar mass of Zn(NO3)2.

  95.39 g/mole
  189 g/mole
  175.39 g/mole
  189.40 g/mole
  127.39 g/mole


#3:    Calculate the number of moles of fluorine in a 15 mole sample of SF6.

90 moles of fluorine
90. moles of fluorine
6 moles of fluorine
6.0 moles of fluorine
15 moles of fluorine


#4:    Calculate the number of moles of fluorine in a 15 g sample of SF6.

0.103 moles of fluorine
0.62 moles of fluorine
0.10 moles of fluorine
0.616 moles of fluorine
0.6 moles of fluorine


#5:   Calculate the number of moles of nitrogen in a 24 mole sample of Zn(NO3)2.

72 moles of nitrogen
4 moles of nitrogen
12 moles of nitrogen
24 moles of nitrogen
48 moles of nitrogen


#6:   Calculate the number of moles of nitrogen in a 24 g sample of Zn(NO3)2.

48 moles of nitrogen
24 moles of nitrogen
0.13 moles of nitrogen
0.25 moles of nitrogen
0.50 moles of nitrogen


#7:    Calculate the number of moles of gold in a 520 g sample of gold.

2.6 moles of gold
1.6 x 1024 moles of gold
1.6 moles of gold
1.59 x 1024 moles of gold
2.64 moles of gold


#8:    Calculate the number of atoms of gold in a 520 g sample of gold.

2.6 atoms of gold
1.6 x 1024 atoms of gold
1.6 atoms of gold
1.59 x 1024 atoms of gold
2.64 atoms of gold


#9:    Calculate the number of atoms of gold in a 5.2 mole sample of gold.

3.1 x 1024 atoms of gold
3.1 atoms of gold
5.2 x 1023 atoms of gold
5.2 atoms of gold
1.6 x 1024 atoms of gold


#10:   Calculate the mass (in grams) of one atom of lead.

207.2 g
6.02 x 1023 g
3.44 x 10-25 g
3.44 x 1025
3.44 x 10-22


 #11:   Calculate the number of moles of neon in a 66 g sample of neon.

  3.3 moles
  1300 moles
  3.271 moles
  1.96 x 1024 moles 
  2.0 x 1024 moles 


 #12:   Calculate the number of atoms of neon in a 88.5 g sample of neon.

5.33 x 1025 atoms
1.21 x 1025 atoms
2.64 x 1024 atoms
1.2 x 1025 atoms
2.6 x 1024 atoms


 #13:   Calculate the number of atoms of neon in a 8.20 mole sample of neon.

4.94 x 1024 atoms
2.45 x 1023 atoms
4.9 x 1024 atoms
2.5 x 1023 atoms 
2.45 x 1024 atoms 


 #14:   Calculate the number of moles of chloroform, CHCl3 in a 480. g sample of chloroform.

4.8 moles
9.9 moles
9.90 moles
4.0 moles
4.02 moles


 #15:   Calculate the number of molecules of chloroform, CHCl3 in a 7.54 g sample of chloroform.

6.02 x 1023 molecules
5.0 x 1024 molecules
4.54 x 1024 molecules
3.80 x 1022 molecules
4.0 x 1022 molecules


 #16:   Calculate the number of molecules of chloroform, CHCl3 in a 3.9 mole sample of chloroform.

2.3 x 1024 molecules
2.0 x 1022 molecules
1.9 x 1022 molecules
2.0 x 1024 molecules
2.35 x 1024 molecules


 #17:   Calculate the number of moles of sulfur dioxide, SO2, in a 33 g sample of sulfur dioxide.

33 moles
0.515 moles
214 moles 
0.52 moles
2.14 moles


 #18:   Calculate the number of molecules of sulfur dioxide, SO2, in a 44.8 g sample of sulfur dioxide.

2.70 x 1025 molecules
2.70 x 1023 molecules
4.21 x 1025 molecules
4.21 x 1023 molecules 
6.02 x 1023 molecules 


 #19:   Calculate the number of molecules of sulfur dioxide, SO2, in a 0.9555 mole sample of sulfur dioxide.

  5.75 x 1023 molecules
  5.8 x 1023 molecules
  1.59 x 10-24 molecules
  5.752 x 1023 molecules
  1.587 x 1023 molecules


 #20:   Calculate the mass (in grams) of one molecule of water, H2O.

18.02 g
18.02 x 1023 g
18.02 x 10-23 g
1.08 x 1023 g
2.99 x 10-23 g