Mole ratios from a balanced equation
Grade 10 Science Worksheet - Challenge Me
Circle the best answer, or write your answer on the line.
2H₂ + O₂ → 2H₂O (an equation only). H₂O has coefficient 2 and O₂ 1. How many moles of O₂ make 5 mol of water, Esme?
Photosynthesis: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂. Glucose has coefficient 1 and H₂O 6. How many moles of water make 0.3 mol of glucose, Jun?
Respiration: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O. O₂ has coefficient 6 and glucose 1. How many moles of glucose react with 1.2 mol of O₂, Kira?
Bo says 2H₂ + O₂ → 2H₂O shows 2 g of hydrogen meeting 1 g of oxygen. Which reply fits, Luz?
- Disagree: it shows 2 mol of H₂ for each 1 mol of O₂
- Agree: the coefficients are the grams of each gas that react
- Agree: the equation lists the masses
Kira says respiration uses 1 mol of O₂ for each mole of glucose. Which reply fits, Milo?
- Agree: each substance in any equation reacts 1 to 1
- Agree: the subscripts carry the ratio
- Disagree: 6 mol of O₂ for each mole of glucose
Jun says that in photosynthesis 6 g of CO₂ makes 1 g of glucose. Which reply fits, Noah?
- Agree: 6 to 1 holds in any unit
- Agree: the coefficients give the grams
- Disagree: 6 mol of CO₂ makes 1 mol of glucose
In respiration (1 glucose : 6 CO₂), how many CO₂ molecules form from 6.022 × 10²³ glucose molecules, Ren?
- 6.022 × 10²³
- 3.6132 × 10²⁴
- 1.0037 × 10²³
In photosynthesis (6 CO₂ : 6 O₂), how many O₂ molecules form when 3.6132 × 10²⁴ CO₂ molecules are used, Tala?
- 3.6132 × 10²⁴
- 6.022 × 10²³
- 2.1679 × 10²⁵
Respiration (C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O) uses 3 mol of O₂. How many moles of water form, and of glucose are used, Zee?
- 3 mol of water; 0.5 mol of glucose
- 3 mol of water; 3 mol of glucose
- 0.5 mol of water; 3 mol of glucose
In 2H₂ + O₂ → 2H₂O, 6 mol of water form. How many moles of each reactant were used, Ari?
- 6 mol of H₂ and 3 mol of O₂
- 6 mol of each reactant
- 3 mol of H₂ and 6 mol of O₂
