Question detail
What mass of potassium sulfate (K2SO4) is produced from 2 moles of potassium (K) reacting with sulfuric acid (H2SO4)? (Mr of K2SO4 = 174 g/mol)
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Use of amount of substance in relation to masses of pure substances
Question
- A. 348 g
- B. 174 g
- C. 87 g
- D. 696 g
Answer
348 g
Explanation
From the balanced equation, 2 moles of K produce 1 mole of K2SO4. Therefore, 2 moles of K yield 348 grams of K2SO4.
Common mistake
Confusing Mole Ratios
Students often confuse mole ratios with mass ratios when balancing equations from data.
To fix this, remember that mole ratios are derived from the coefficients in a balanced equation, while mass ratios depend on the relative formula masses of the substances involved.
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