calculate the mass of 1 molecule of i) oxygen ii) ammonia....
plz help me out...
See molar mass of a compound or molecular mass of an element is the mass of 1 mole of that substance.
1 mole = 6.023 x 1023 particles.
Now, for oxygen
1 mole of oxygen weighs 32 g.
6.023 x 1023 molecule of Oxygen = 32 g
1 molecule of oxygen = (32 / 6.023 x 1023) = 5.31 x 10-23 g = 5.31 x 10-20 kg.
Similarly,
1 mole of ammonia weighs 17 g.
6.023 x 1023 molecule of ammonia = 17 g
1 molecule of ammonia = (17 / 6.023 x 1023) = 2.82 x 10-23 g = 2.82 x 10-20 kg.