Chapter 5 – Practice Problems (Stoichiometry)
- Think back to the pound cake recipe. What possible conversion factors can you construct relating the components of the recipe?
- Think back to the pancake recipe. What possible conversion factors can you construct relating the components of the recipe?
- What are all the conversion factors that can be constructed from the balanced chemical reaction: 2H2(g) + O2(g) → 2 H2O(ℓ)
- What are all the conversion factors that can be constructed from the balanced chemical reaction: N2(g) + 3H2(g) → 2NH3(g)?
- Given the chemical equation : Na(s) + H2O(ℓ) → NaOH(aq) + H2(g)
- a. Balance the equation.
- b. How many molecules of H2 are produced when 332 atoms of Na react?
- Given the chemical equation: S(s) + O2(g) → SO3(g)
- a. Balance the equation.
- b. How many molecules of O2 are needed when 38 atoms of S react?
- For the balanced chemical equation: 6H+(aq) + 2MnO4−(aq) + 5H2O2(ℓ) → 2Mn2+(aq) + 5O2(g) + 8H2O(ℓ)
- How many molecules of H2O are produced when 75 molecules of H2O2 react?
- For the balanced chemical reaction: 2C6H6(ℓ) + 15O2(g) → 12CO2(g) + 6H2O(ℓ)
- How many molecules of CO2 are produced when 56 molecules of C6H6 react?
- How many molecules of CO2 are produced when 56 molecules of C6H6 react?
- Given the balanced chemical equation: Fe2O3(s) + 3SO3(g) → Fe2(SO4)3
- How many molecules of Fe2(SO4)3 are produced if 321 atoms of S are reacted?
- How many molecules of Fe2(SO4)3 are produced if 321 atoms of S are reacted?
- For the balanced chemical equation: CuO(s) + H2S(g) → CuS + H2O(ℓ)
- How many molecules of CuS are formed if 9,044 atoms of H react?
- How many molecules of CuS are formed if 9,044 atoms of H react?
- For the balanced chemical equation: Fe2O3(s) + 3SO3(g) → Fe2(SO4)3
- Suppose we need to make 145,000 molecules of Fe2(SO4)3, how many molecules of SO3 do we need?
- Suppose we need to make 145,000 molecules of Fe2(SO4)3, how many molecules of SO3 do we need?
- One way to make sulfur hexafluoride is to react thioformaldehyde, CH2S, with elemental fluorine: CH2S + 6F2 → CF4 + 2HF + SF6
- If 45,750 molecules of SF6 are needed, how many molecules of F2 are required?
- If 45,750 molecules of SF6 are needed, how many molecules of F2 are required?
- Construct the three independent conversion factors possible for these two reactions:
- a. 2H2 + O2 → 2H2O
- b. H2 + O2 → H2O2
Why are the ratios between H2 and O2 different?
The conversion factors are different because the stoichiometry of the balanced chemical reactions are different.
- Construct the three independent conversion factors possible for these two reactions:
- a. 2Na + Cl2 → 2NaCl
- b. 4Na + 2Cl2 → 4NaCl
What similarities, if any, exist in the conversion factors from these two reactions?
