Mole ratios from a balanced equation
Grade 10 Science Worksheet
Circle the best answer, or write your answer on the line.
2H₂ + O₂ → 2H₂O (an equation only). O₂ has coefficient 1 and H₂O 2. How many moles of water form from 3 mol of O₂, Esme?
To find mol O₂ from mol H₂ in 2H₂ + O₂ → 2H₂O, which factor do you use, Kira?
- 2 mol O₂ ÷ 2 mol H₂
- 2 mol H₂ ÷ 1 mol O₂
- 1 mol O₂ ÷ 2 mol H₂
To find mol O₂ made from mol CO₂ in 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂, which factor works, Luz?
- 6 mol O₂ ÷ 6 mol CO₂
- 1 mol O₂ ÷ 6 mol CO₂
- 2 mol O₂ ÷ 1 mol CO₂
To find mol glucose used from mol O₂ in C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O, which factor works, Milo?
- 6 mol O₂ ÷ 1 mol C₆H₁₂O₆
- 1 mol C₆H₁₂O₆ ÷ 1 mol O₂
- 1 mol C₆H₁₂O₆ ÷ 6 mol O₂
A plant makes 3 mol of O₂ by photosynthesis (6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂). How many moles of CO₂ did it use, Noah?
- 18 mol, from 3 × 6
- 3 mol, from the 6 : 6 ratio
- 0.5 mol, from 3 ÷ 6
A runner's cells use 0.1 mol of glucose by respiration (1 glucose : 6 O₂). How many moles of O₂ do they use, Pia?
- 0.1 mol, one O₂ for each glucose
- 0.6 mol, from 0.1 × 6
- 0.02 mol, from 0.1 ÷ 6
A cake's 0.2 mol of baking soda reacts fully with vinegar (1 : 1 to CO₂). How many moles of CO₂ form, Ren?
- 0.4 mol, from the 2 O atoms in CO₂
- 0.2 mol, from the 1 : 1 ratio
- 1.2 mol, from 0.2 × 6
In 2H₂ + O₂ → 2H₂O, does 2 g of H₂ react with 1 g of O₂, Tala?
- No: the 2 : 1 ratio counts moles, not grams
- Yes, if the gases are cold
- Yes: the coefficients give grams
In NaHCO₃ + CH₃COOH → CH₃COONa + H₂O + CO₂, does 1 g of baking soda react with 1 g of the acid, Zee?
- Yes: a 1 : 1 equation means equal grams
- Yes: reactions use equal grams of each reactant
- No: 1 mol to 1 mol, not 1 g to 1 g
In C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O, what does the 1 : 6 between glucose and O₂ count, Ari?
- Atoms: 6 O atoms for each glucose
- Grams: 6 g of O₂ for each gram of glucose
- Moles or molecules: 6 O₂ for each glucose