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1 gram of any sample contains 1 mole of molecules. No it is NOT , it's only true for protons!

Two or more atoms of same kind come together to form a molecule.

Mole is a unit that is used repeatedly in introductory chemistry classes.

Added:

  1. a molecule is a group of chemically bonded atoms.
  2. a mole is a number, like a dozen is 12, a mole is 6.022 x 10^23 , (6.022 x 1023).

    Eg. 1.0 grams of H2 is equal to 0.5 mole H2 and it contains 3.011 x 1023 H2 molecules

    and 1.0 grams of O2 is equal to 0.03125 mole O2, it contains 1.882 x 1022 O2 molecules

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