Question

Calculate the mass of the following = 1.5 *10 23 molecules of NH3.

Answer 1

6×10^23×n=1.5×10^23
4n=1
n=1/4
1/4=x/17
x=17/4

Answer 2

Mass of 1 mole of NH3 molecule = 17 g.

So 6.023 x 1023 molecules = 17g

∴1.5 x 1023 molecules = 17/ 6.023 x 1023 * 1.5 x 1023 molecules = 4.23 g