Compare the mass of one mole of carbon-12 atoms to the sum of the masses of the particles that it contains.

Answe

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Explanation:

We use the equation:

Mass = Number of moles * Molecular or atomic mass

Since the number of moles is 1 ("one mole of carbon-12 atoms") and the atomic mass of carbon-12 atoms is 12, hence the mass would be 12 grams. Note that the unit grams (g) is used here, as it is the SI unit for mass measurement.

Number of particles in 1 mole = 6.023 × 1023

Mass of 1 electron = 9.10938 × 10-28 gm

Mass of 1 mole of electrons = 6.023 × 1023 × 9.10938 × 10-28  = 5.486  × 10 -4

Mass of 1 proton = 1.67262 × 10 -24 gm

Mass of 1 mole of protons = 6.023 × 1023 × 1.67262 × 10 -24 gm = 1.007 gm

Mass of 1 neutron = 1.67493 × 10-24  gm

Mass of 1 mole of neutron = 1.67493 × 10-24 × 6.023 × 1023   = 1.008 gm