Which has more atoms: a 1-gram sample of carbon-12 or a 1-gram sample of carbon-13?
A)More information is needed.
B)a 1-gram sample of carbon-12
C)a 1-gram sample of carbon-13
D)They have the same number of atoms.

Question

Quizplus · Accepted Answer

A 1-gram sample of carbon-12 has more atoms because the atomic mass of carbon-12 is exactly 12 unified atomic mass units by definition, making it the basis for the mole. Carbon-13, being heavier per atom, means fewer atoms of carbon-13 would make up the same mass.

Which Has More Atoms: a 1-Gram Sample of Carbon-12 or a 1-Gram