ExpertEasy1 markMultiple Choice
AQA GCSE · Question 03.3 · Quantitative chemistry
12 g of carbon contains 6.02 × 10²³ atoms. Which expression is used to calculate the mass of one atom of carbon?
12 g of carbon contains 6.02 × 10²³ atoms. Which expression is used to calculate the mass of one atom of carbon?
Answer options:
A.
12 / (6.02 × 10²³)
B.
(6.02 × 10²³) / 12
C.
12 × 6.02 × 10²³
How to approach this question
You are given the total mass for a specific number of atoms. To find the mass of a single atom, you need to divide the total mass by the number of atoms.
Full Answer
A.12 / (6.02 × 10²³)✓ Correct
12 / (6.02 × 10²³)
The question states that 6.02 × 10²³ atoms of carbon have a mass of 12 g. To find the mass of a single atom, you must divide the total mass by the number of atoms. \n\nMass of one atom = Total mass / Number of atoms\nMass of one atom = 12 g / 6.02 × 10²³ atoms
Common mistakes
✗ Inverting the fraction (dividing number of atoms by mass).\n✗ Multiplying the two numbers together.
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