Question detail
Calculate the number of moles in 12 grams of carbon-12.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Amount of substance
Question
- A. 1 mol
- B. 0.5 mol
- C. 0.1 mol
- D. 2 mol
Answer
1 mol
Explanation
The number of moles can be calculated using the formula: moles = mass / Mr. Here, the mass is 12 g and the relative atomic mass (Mr) of carbon-12 is 12 g/mol. Thus, moles = 12 g / 12 g/mol = 1 mol.
Common mistake
Common Mistake in Avogadro Constant Calculations
Students often forget to convert the particle number to moles using the Avogadro constant before performing calculations.
To fix this, remember the formula: n = N / L, where n is the number of moles, N is the number of particles, and L is the Avogadro constant (6.022 x 10^23 mol^-1). For example, if you have 1.2044 x 10^24 particles, substitute: n = 1.2044 x 10^24 / 6.022 x 10^23 = 2.00 moles.
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