Why does one mole of carbon atoms have a smaller mass than one mole of sulfur atoms?

Every mole of a substance weighs equal to the atomic mass of that substance. Atomic mass depends on the number of protons and number of neutrons.

Carbon is an element with atomic number of 6 and mass number of 12. Thus it has 6 protons and 6 neutrons.

Sulphur is an element with atomic number of 16 and mass number of 32. Thus it has 16 protons and 16 neutrons.

Carbon has an atomic mass of 12 whereas sulphur has an atomic mass of 32.

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