Moles of Matter

Question 1

3.194 reams of paper (1 ream = 500 sheets)

Answer 1

1597 sheets of paper

Question 2

3.194 moles of rice grains

Answer 2

1.923 × 10^24 rice grains

Question 3

31.94 moles of indium atoms

Answer 3

1.923 × 10^25 In atoms

Question 4

Perform each calculation for bismuth, Bi.

a) Convert 4.321 × 1021 atoms to moles.

b) Convert 4.321 moles to number of atoms.

c) Calculate the molar mass.

d) Convert 4.321 grams to moles.

e) Convert 4.321 moles to grams.

Answer 4

a) 0.007175 mol

b) 2.602 × 10^24 atoms

c) 209.0 g/mol

d) 0.02067 mol

e)903.1 g

Question 5

Perform each calculation for nitrogen gas, N2.

a) Convert 5.75 × 1022 molecules to moles.

b) Convert 5.75 moles to number of molecules.

c) Convert 5.75 moles to number of each type of atom.

Answer 5

a) 0.0955 mol

b) 3.46 × 10^24 molecules

c) N: 6.93 × 10^24 atoms

Question 6

Perform each calculation for nitrogen gas, N2.

a) Calculate the molar mass.

b) Convert 5.75 grams to moles.

c) Convert 5.75 moles to grams.

Answer 6

a) 28.02 g/mol

b) 0.205 mol

c) 161 g

Question 7

Perform each calculation for uranium (VI) fluoride, UF6.

a) Convert 1.06 × 1025 molecules to moles.

b) Convert 1.06 moles to number of molecules.

c) Convert 1.06 moles to number of each type of atom.

Answer 7

a) 17.6 mol

b) 6.38 × 10^23 molecules

c)
U: 6.38 × 10^23 atoms

F: 3.83 × 10^24 atoms

Question 8

Perform each calculation for uranium (VI) fluoride, UF6.

a) Calculate the molar mass.

b) Convert 1.06 grams to moles.

c) Convert 1.06 moles to grams.

Answer 8

a) 352.0 g/mol

b) 0.00301 mol

c) 373 g

Question 9

Perform each calculation for ribose, C5H10O5 (a monosaccharide, or carbohydrate).

a) Convert 6.00 × 1023 molecules to moles.

b) Convert 6.00 moles to number of molecules.

c) Convert 6.00 moles to number of each type of atom.

Answer 9

a) 0.996 mol

b) 3.61 × 10^24 molecules

c)

C: 1.81 × 10^25 atoms

H: 3.61 × 10^25 atoms

O: 1.81 × 10^25 atoms

Question 10

Perform each calculation for ribose, C5H10O5 (a monosaccharide, or carbohydrate).

a) Calculate the molar mass.

b) Convert 6.00 grams to moles.

c) Convert 6.00 moles to grams.

Answer 10

a) 150.13 g/mol

b) 0.0400 mol

c) 901 g

Question 11

Perform each calculation for boric acid, H3BO3.

a) Convert 9 × 1021 molecules to moles.

b) Convert 0.9 moles to number of molecules.

c) Convert 0.9 moles to number of each type of atom.

Answer 11

a) 0.01 mol

b) 5 × 10^23 molecules

c)

H: 2 × 10^24 atoms

B: 5 × 10^23 atoms

O: 2 × 10^24 atoms

Question 12

Perform each calculation for boric acid, H3BO3.

a) Calculate the molar mass.

b) Convert 0.9 grams to moles.

c) Convert 0.9 moles to grams.

Answer 12

a) 61.83 g/mol

b) 0.01 mol

c) 60 g

Question 13

Perform each calculation for chloric acid, HClO3.

a) Convert 1.73 × 1025 molecules to moles.

b) Convert 0.173 moles to number of molecules.

c) Convert 0.173 moles to number of each type of atom.

Answer 13

a) 28.7 mol

b) 1.04 × 10^23 molecules

c)

H: 1.04 × 10^23 atoms

Cl: 1.04 × 10^23 atoms

O: 3.13 × 10^23 atoms

Question 14

Perform each calculation for chloric acid, HClO3.

a) Calculate the molar mass.

b) Convert 0.173 grams to moles.

c) Convert 0.173 moles to grams.

Answer 14

a) 84.46 g/mol

b) 0.00205 mol

c) 14.6 g