Question

no.of atoms in 4.25g of NH3 is

Answer 1

Dear student..

Molar mass NH3 = 14+3 = 17g/mol
given mass = 4.25g

no of moles = 4.25/17 = 0.25 mol of NH3

1 mol of NH3 contains 6.022*10^23 molecules
0.25 mol NH3 contains 0.25*6.022*10^23 = 1.5055*10^23 molecules

1 molecule of NH3 contains 4 atoms
Number of atoms in 1.5055*10^23 molecules = 4*1.5055*10^23 atoms.

The correct answer is = 6.022*10^23 atoms.

Answer 2

Answer:

Molar mass of NH3 = 17g

No of moles = 4.25/17 moles

=1/4moles

1moles of NH3 = 6.10²³ (approximate)

1/4moles of NH3 = 1/4 ×6×10²³

=3/2 .10²³

4 atoms is equal to 4.3/2.10²³