How old is a bottle of wine if the tritium (H-3) activity is 25% that of new wine? (H-3 half life = 12.3 years)

The answer would be

The molar mass of a substance is defined as the mass of 1 mol of that substance, expressed in grams per mole, and is equal to the mass of 6.022 × 10 23 atoms, molecules, or formula units of that substance.

Answer earth,water,fire and air;