Question

define molecular mass taking c-12 isotope as the standard substance
please answer ASAP​

Answer 1

Answer:

∴ Gram atomic mass of oxygen = 16 g.

Molecular Mass

The molecular mass of a substance is the number of times the molecule of the substance is heavier than one-twelth the mass of an atom of carbon -12. Or, the molecular mass is equal to the sum of its atomic masses of all the atoms present in one molecule of a substance. For eg: Water (H2O)

Atomic mass of H= 1 unit

Atomic mass of O =16 units

The molecular mass of water = 2 × atomic mass of H+1 × atomic mass of O

= 2 × 1 + 16 × 1

= 18 units

Gram Molecular Mass

The molecular mass of a substance expressed in grams is the gram molecular mass. For eg: Molecular mass of oxygen = 32u

∴ Gram molecular mass of oxygen = 32 g

Explanation:

Carbon-12 is of particular importance in its use as the standard from which atomic masses of all nuclides are measured, thus, its atomic mass is exactly 12 daltons by definition. Carbon-12 is composed of 6 protons, 6 neutrons, and 6 electrons.