Question

Number of moles in 17 grams of
Ammonia(NH3) are ........?

Answer 1

Given mass = 17 g

Molar mass = 14 + 3 ( 1 ) = 17 g

No. of moles = Given mass / Molar mass

No. of moles = 17 g / 17 g

$<b>No. of moles = 1</b>$

Answer 2

1 mole will be equal to the molecular weight of the substance in grams.
molecular weight of NH3 = 17u
The no.of moles of 17 g od NH3 = 1 mole!