A. Interpret the following reactions in terms of representative particles, moles and mass:
1. 2 Mg (s) + O₂ (g) → 2 MgO (s)
- Representative particles: 2 atoms Mg + 1 molecule O₂ → 2 formula units MgO
- Moles: 2 mol Mg + 1 mol O₂ → 2 mol MgO
- Mass: 48.6 g Mg + 32.0 g O₂ → 80.6 g MgO
2. 2 Na (s) + 2 H₂O (aq) → 2 NaOH (aq) + H₂ (l)
- Representative particles: 2 atoms Na + 2 molecules H₂O → 2 formula units NaOH + 1 molecule H₂
- Moles: 2 mol Na + 2 mol H₂O → 2 mol NaOH + 1 mol H₂
- Mass: 46.0 g Na + 36.0 g H₂O → 80.0 g NaOH + 2.0 g H₂
B. Solve the following stoichiometry problems and write the correct answer with units.
1. 18.00 moles O₂
2. 1.75 moles Cu
3. 30 moles CO₂
4. 11.4 moles HCl
5. 87.5 moles O₂
Parent Tip: Review the logic above to help your child master the concept of chemistry stoichiometry worksheet.
