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Comparing Waste in Two Model Reactions 4 questions
Comparing Waste in Two Model Reactions
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A classroom display compares two model reactions that make the same desired product, AB. The letters represent different kinds of atoms. Their model masses are A = 10, B = 20, and C = 5 mass units per atom. The equations represent one complete reaction event each.
Route P: A2 + B2 → 2AB
Route Q: 2AC + B2 → 2AB + C2
Question 1
Which statement compares the desired products of the two events?
- P makes two AB particles, and Q makes one.
- Both make two AB particles, and Q also makes a by-product.
- Q makes twice as much AB as P.
- Both make AB and the same amount of by-product.
Question 2
Calculate the total mass of the products of Q in model mass units. Show how both products are counted.
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In repeated model trials, the two routes start with enough reactants to make 60 units of AB mass each. The team recovers 42 units of AB from P and 54 units of AB from Q.
Question 3
Calculate the fraction of the expected AB mass recovered from each route. Show your work.
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Question 4
A student says the route with the higher recovered fraction must make less by-product. Use the equations and recovery results to evaluate the claim.
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