If % yield and actual yield is 80 and 20 g respectively, what will be theoretical yield?
Correct answer: B. 25 g
- A. 20 g
- B. 25 g
- C. 30 g
- D. 40 g
Explanation
Rearranging the percentage yield formula, the theoretical yield is the actual yield multiplied by 100 and divided by the percentage, so 20 times 100 over 80 gives 25 g. The theoretical yield must always exceed the actual yield, so any answer of 20 g or less can be rejected immediately. This is the reverse of the earlier question in the same paper.
This question appeared on the UHS MDCAT 2025 paper, which you can sit online with every answer explained.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Theoretical and Percentage Yield
Theoretical yield is the maximum product predicted from a balanced equation and the amount of limiting reactant. Work includes identifying the limiting reagent, comparing theoretical and actual yield, and calculating percentage yield using stoichiometric mole relationships.
Practise Fundamental Concepts of Chemistry
894 free Fundamental Concepts of Chemistry MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Theoretical and Percentage Yield questions
A chemical reaction has a theoretical yield of 25 g, but only 20 g of product was obtained. What is the percentage yield of the reaction?
Consider the given balanced chemical equation: 2H2 + O2 gives 2H2O. If 4 g of H2 reacts with 32 g of O2 to produce 28 g of H2O, what is the percentage yield of the reaction? (Molar mass of H2 = 2 g/mol, O2 = 32 g/mol and H2O = 18 g/mol)
How many grams of calcium oxide are produced when 1 mole of calcium carbonate decomposes completely, given CaCO3 gives CaO + CO2?
The theoretical yield is, when % yield and actual yied are 55% and 24g respectively:
The maximum amount of product obtained by balanced chemical equation is called as __________?
Phosphoric acid, H3PO4 is one of the main ingredients of soft drinks, detergents, and fertilizers. It can be prepared with a series of reactions: P4 + 5O2 → P4O10 P4O10+6H2O → 4H3PO4Let us say we allow 1000 kg of phosphorus to react with oxygen in the tank to yield 90% of tetra phosphorus decaoxide (P4O10). In the second step of the reaction, we react it with water to yield 97% of H3PO4. How much, in kilogram, of H3PO4 was produced after a series of reactions?