Question detail
A reaction produces 72 cm3 of gas in 24 seconds. Calculate the mean rate of product formation and state the unit.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Rate of reaction
Question
A reaction produces 72 cm3 of gas in 24 seconds. Calculate the mean rate of product formation and state the unit.
Answer
Mean rate = 72 cm3 ? 24 s = 3 cm3/s. The unit is cm3/s because the measured product is gas volume and it is divided by time.
Explanation
This worked answer is correct because it uses the product-formation method: quantity of product formed divided by time taken. It keeps product volume separate from reactant mass loss and includes the rate unit cm3/s.
Common mistake
Confusing Rate Calculation
Students often confuse the formula for calculating the mean rate of reaction by using the quantity of reactant instead of the quantity of product formed.
Always ensure to use the quantity of product formed divided by the time taken when calculating the mean rate of reaction.
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.