# Moles & Grams – Stoichiometry Worksheet

### Moles & Grams, Stoichiometry Worksheet – Chemistry

The key terms in this Stoichiometry worksheet include Moles, Grams.

SHOW WORK on separate paper and copy final answers in the boxes provided. Use correct number of significant figures and report units with answers where required.

• Find the number of moles in 25.0 grams of each of the following:

1. Ni                                b.         C6H6                             c.         Ca(OH)
##### Calculations

Find the number of moles in 25.0 grams of each of the following:

Ni

25.0 g  x  1/58.7 = 0.43 mol

C6H6

25.0 g  x  1/78.1 = 0.32 mol

Ca(OH)

25.0 g  x  1/74.09  = 0.34 mol

• Find the mass of 0.750 moles of each of the following:

1. Br                             b.         P4O10                            c.         Cu2S
##### Calculations

Find the mass of 0.750 moles of each of the following:

Br2

0.750  x  159.8 = 119.86 g

P4O10

0.750  x   283.89 = 212.92 g

Cu2S

0.750  x  159.7 = 119.8 g

• Find the number of particles in 35.0 grams of each of the following:
1. Ag                               b.         CF4                              c.         C6H12O6
##### Calculations

Find the number of particles in 35.0 grams of each of the following:

Ag

35  x  1/107.9 =  0.324 mol

1 mol = 6.022 x 1023 particles

0.324  x  6.022 x 1023 = 1.95 x 1023 particles

CF4

35 x  1/88 = 0.398 mol

1 mol = 6.022 x 1023 particles

0.398 x 6.022 x 1023 = 2.395 x 1023 particles

C6H12O6

35 x 1/180.2 = 0.194 mol

1 mol = 6.022 x 1023 particles 0.194 x 6.022 x 1023 = 1.169 x 1023 particles

SHOW WORK on separate paper and copy final answers in the boxes provided. Use correct number of significant figures and report units with answers where required.

• Find the number of moles in 25.0 grams of each of the following:

1. Ni                                b.         C6H6                             c.         Ca(OH)
##### Calculations

Find the number of moles in 25.0 grams of each of the following:

Ni

25.0 g  x  1/58.7 = 0.43 mol

C6H6

25.0 g  x  1/78.1 = 0.32 mol

Ca(OH)

25.0 g  x  1/74.09  = 0.34 mol

• Find the mass of 0.750 moles of each of the following:

1. Br                             b.         P4O10                            c.         Cu2S
##### Calculations

Find the mass of 0.750 moles of each of the following:

Br2

0.750  x  159.8 = 119.86 g

P4O10

0.750  x   283.89 = 212.92 g

Cu2S

0.750  x  159.7 = 119.8 g

• Find the number of particles in 35.0 grams of each of the following:
1. Ag                               b.         CF4                              c.         C6H12O6
##### Calculations

Find the number of particles in 35.0 grams of each of the following:

Ag

35  x  1/107.9 =  0.324 mol

1 mol = 6.022 x 1023 particles

0.324  x  6.022 x 1023 = 1.95 x 1023 particles

CF4

35 x  1/88 = 0.398 mol

1 mol = 6.022 x 1023 particles

0.398 x 6.022 x 1023 = 2.395 x 1023 particles

C6H12O6

35 x 1/180.2 = 0.194 mol

1 mol = 6.022 x 1023 particles 0.194 x 6.022 x 1023 = 1.169 x 1023 particles

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