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.

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