Question

1 mole of ammonia is of 17g. Then what is mass of 0.3 moles of ammonia?

Answer 1

Answer:

1 mole of ammonia=17g

0.3 mole of ammonia =0.3 × 17

=5.1 g

Answer 2

Answer:

0.3 moles of ammonia is 5.1g.

Explanation:

One mole is 6.02214076×10²³ elementary entities. Here, the entity is the molecule called ammonia. One mole of ammonia also refers to the molecular mass of ammonia. Hence the molecular mass of ammonia is 17g itself.

Number of moles = Mass of substance÷ Molecular mass of a substance

1 mole  =  17g = Molecular mass

0.3 mole =  Mass of substance÷ Molecular mass of a substance

0.3 mole =  Mass of substance÷ 17

Mass of substance = 0.3×17 = 5.1g

Thus the mass of 0.3 moles of ammonia is 5.1g.