Question detail
A balance shows a mass loss of 12 g in 4 seconds. What is the mean rate of mass loss?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Rate of reaction
Question
- A. 3 g/s
- B. 48 g/s
- C. 0.25 g/s
- D. 16 g/s
Answer
3 g/s. Mass loss rate = 12 g ? 4 s = 3 g/s.
Explanation
3 g/s is correct because the balance records how quickly mass is lost. This is a reactant-use or gas-loss method, so the mass change is divided by time.
Common mistake
Confusing Rate Calculation
Students often confuse the formula for calculating the mean rate of reaction, mistakenly using the time taken as the numerator instead of the quantity of reactant used.
Remember that the mean rate of reaction is calculated by dividing the quantity of reactant used by the time taken. Ensure you set up the formula correctly as mean rate = quantity of reactant used / time.
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