Another basic definition
Classical Mechanics
Level
3
How is a mole defined?
exactly
times the reciprocal of the mass of a proton in kilograms
None of these
The number of carbon atoms in
grams of carbon
The number of hydrogen atoms in
gram of hydrogen
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1 solution
The mole is actually defined as the number of carbon-12 atoms in 12 grams. Note that this is not the same as the number of carbon atoms, because carbon consists of three naturally occurring isotopes: C-12, C-13, and C-14.