Chapter 5 – Practice Problem (Stoichiometry) Solutions – Odd Answers

1. [latex]\dfrac{1\, pound\, butter}{1\, pound\, flour}[/latex] [Or] [latex]\dfrac{1\, pound\, sugar}{1\, pound\, eggs}[/latex] are two conversion factors that can be constructed from the pound cake recipe. Other conversion factors are also possible.

3. [latex]\dfrac{2\, molecules\, H_{2}}{1\, molecule\, O_{2}}, \dfrac{1\, molecule\, O_{2}}{2\, molecules\, H_{2}O}, \dfrac{2\, molecules\, H_{2}}{2\, molecules\, H_{2}O}[/latex] and their reciprocals are the conversion factors that can be constructed.

5.

• a. 2Na(s) + 2H₂O(ℓ) → 2NaOH(aq) + H₂(g)
• b. 166 molecules

7. 120 molecules

9. 107 molecules

11. 435,000 molecules

13.

• a. [latex]\dfrac{2\, molecules\, H_{2}}{1\, molecule\, O_{2}}\ , \dfrac{1\, molecule\, O_{2}}{2\, molecules\, H_{2}O}\ , \dfrac{2\, molecules\, H_{2}}{2\, molecules\, H_{2}O}[/latex]
• b. [latex]\dfrac{1\, molecules\, H_{2}}{1\, molecule\, O_{2}}\ , \dfrac{1\, molecule\, O_{2}}{2\, molecules\, H_{2}O_{2}}\ , \dfrac{1\, molecule\, H_{2}}{1\, molecule\, H_{2}O_{2}}[/latex]