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Stoichiometry Warm-Up with Magnesium: Example Problems & Percent Yield

Practice stoichiometry with magnesium burning in air. Includes example problems, percent yield calculation, and common questions.

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Stoichiometry Warm-Up with Magnesium: Example Problems & Percent Yield

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  1. Stoichiometry

  2. Warm-Up

  3. Warm-Up

  4. Warm-Up

  5. Magnesium metal burns in the air Example of stoich problem Mg(s) + O2(g) MgO(s) 2 Mg(s) + O2(g) 2 MgO(s) 3g ? g

  6. 2 Mg(s) + O2(g) 2 MgO(s) Example of stoich problem 0.123 mol 0.123 mol 40.3 g/mol 24.3 g/mol 3 g ? g 3 g 1 mol 0.123 mol 40.3 g 24.3 g 1 mol

  7. 2 Mg(s) + O2(g) 2 MgO(s) Example of stoich problem 0.123 mol 0.123 mol 40.3 g/mol 24.3 g/mol 3 g 4.96 g 3 g 1 mol 0.123 mol 40.3 g 24.3 g 1 mol

  8. 2 Mg(s) + O2(g) 2 MgO(s) Percent Yield 0.123 mol 0.123 mol 40.3 g/mol 24.3 g/mol 3 g 4.96 g (theoretical) 3.72 g (actual) 3.72/4.96 x 100% = 75%

  9. 2 Mg(s) + O2(g) 2 MgO(s) Questions that can be asked 0.123 mol 0.123 mol 24.3 g/mol 40.3 g/mol 3 g ? g

  10. 2 Mg(s) + O2(g) 2 MgO(s) Questions that can be asked 0.123 mol 0.123 mol 32.0 g/mol 24.3 g/mol 3 g ? g How much oxygen is used in this reaction?

  11. 2 Mg(s) + O2(g) 2 MgO(s) Questions that can be asked 0.123 mol 0.123 mol 32.0 g/mol 24.3 g/mol 3 g ? g mole ratio 3 g Mg 1 mol O2 1 mol Mg 32.0 g O2 = 1.97 g O2 1 mol O2 2mol Mg 24.3 g Mg

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