Question

What will be the mole of nitrogen present in 23 grams FeNO3

Answer 1

FeNO3 has molecular mass 56+14+48=118 gram.

As you know number of moles=mass/molecular mass=23/118=0.194 moles.

In one mole of FeNO3 there exists one mole nitrogen.

So in 0.194 moles there will be 0.194 moles of nitrogen.

Thanks.
Tripathy

Answer 2

Total mass of FeNO3 is
56+14+3(16) = 118 gm

118 gm FeNO3 contains 1 mole of nitrogen
then 23gm of FeNO3 contains

23/118 = 0.1949 moles