Practice question · Multiple choice
A reaction runs out of one reactant while another remains. Why does the limiting reagent determine the yield rather than the total mass of reactants?
Hints
- Think of assembling bicycles from frames and wheels.
- The ratio is in particles, not in grams.
Show the answer
C. Because reactions consume reactants in fixed MOLE ratios
Why
Stoichiometry counts particles. Extra frames do not become bicycles once the wheels run out, and mass is the wrong currency for the comparison.
Practise Stoichiometric relationships
The app has 8 more questions on this lesson, and keeps your place in the course. Physics I is free to start.
More questions on Stoichiometric relationships
- Order the steps to balance a chemical equation by inspection.
- For the reaction 2H2 + O2 → 2H2O, you mix 4 mol of H2 with 1 mol of O2. What limits the water you can make?
- Propane burns: C3H8 + 5O2 → 3CO2 + 4H2O. How many moles of O2 are needed to burn 2 mol of propane completely?
- In a balanced chemical equation, the number of atoms of each element is the same on both sides.