Moles & Grams – Stoichiometry Worksheet

Moles & Grams, Stoichiometry Worksheet – Chemistry

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

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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)₂ 

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)₂ 

25.0 g  x  1/74.09  = 0.34 mol

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• Find the mass of 0.750 moles of each of the following:
  1. 
     Br₂                               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

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• 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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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)₂ 

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)₂ 

25.0 g  x  1/74.09  = 0.34 mol

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• Find the mass of 0.750 moles of each of the following:
  1. 
     Br₂                               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

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• 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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