Find the limiting reactant

Answer Key - Grade 10 Science Worksheet - Challenge Me

Circle the best answer, or write your answer on the line.

1. 1.

   12.601 g of baking soda (84.01 g/mol) meets 10.51 g of vinegar acid (60.06 g/mol); they react 1 : 1 to give CO₂ (44.01 g/mol). How many grams of CO₂ form, to 0.01 g, Esme?

   6.6 g
2. 2.

   8.401 g of baking soda (84.01 g/mol) meets 12.012 g of vinegar acid (60.06 g/mol); they react 1 : 1 to give CO₂ (44.01 g/mol). How many grams of CO₂ form, to 0.01 g, Jun?

   4.4 g
3. 3.

   Ari says the reactant with fewer grams is always the limiting one. Which reply fits, Luz?

   • Agree, when both reactants are solids
   • Disagree: compare moles divided by coefficients, not grams
   • Agree: less mass means it runs out first
4. 4.

   Luz says that with 4.04 g of H₂ and 16.00 g of O₂, the H₂ limits because it has less mass. Which reply fits, Milo?

   • Agree: 4.04 g is less than 16.00 g
   • Disagree: 0.5 mol of O₂ is less than the 1 mol needed
   • Agree: hydrogen is the limiting gas in this equation
5. 5.

   Pia says the amount of product depends on the reactant in excess. Which reply fits, Noah?

   • Agree: the extra reactant makes extra product
   • Agree: more of a reactant means more product
   • Disagree: the limiting reactant sets the product
6. 6.

   Respiration: 90.09 g of glucose (180.18 g/mol) and 64.00 g of O₂ (32.00 g/mol). Which is limiting, and how much CO₂ forms, Pia?

   • O₂ limits; 2 mol of CO₂, or 88.02 g, forms
   • Glucose limits, giving 132.03 g of CO₂
   • O₂ limits, but CO₂ is 64.00 g, the O₂'s mass
7. 7.

   2H₂ + O₂ → 2H₂O (an equation only): 6.06 g of H₂ (2.02 g/mol) and 32.00 g of O₂. Which limits, and how much water forms, Ren?

   • H₂ limits, giving 54.06 g of water
   • O₂ limits; 2 mol of water, or 36.04 g
   • H₂ limits, since 6.06 g is the smaller mass
8. 8.

   Baking soda, 25.203 g (84.01 g/mol, 0.3 mol), and vinegar acid, 0.2 mol, react 1 : 1. How many grams of CO₂ (44.01 g/mol) form, Tala?

   • 13.20 g, from the 0.3 mol of baking soda
   • 25.20 g, the baking soda's mass
   • 8.80 g, from the 0.2 mol of acid
9. 9.

   In 2H₂ + O₂ → 2H₂O, 3 mol of H₂ and 1 mol of O₂ react. How many grams of H₂ (2.02 g/mol) are left over, Ari?

   • 2.02 g of H₂
   • 4.04 g of H₂
   • 0 g: the H₂ is used up
10. 10.

    A bowl has plenty of baking soda but a little vinegar. Which change makes more CO₂, Bo?

    • Add more baking soda, which is already in excess
    • Add more vinegar, the limiting reactant
    • Stir longer with the same amounts