Question

The number of moles of ammonia that have the same mass as that of 3 moles of carbon dioxide

Answer 1

Carbon dioxide has molecular mass 44 gram.
So 3 moles of carbon dioxide means 132 gram of carbon dioxide.

Molecular mass of ammonia,NH3 is 17 gram.

So no. of moles=Mass/Molecular mass.

Hence,the answer is 132/17=7.76 mol.

Thanks.
Tripathy