Question

what is the mass of 0.5 mole of NH3 ? Given atomic mass of N = 14u , Atomic mass of (H) = 1u

Answer 1

Hello There !

Answer:

8.5 u

Step-by-step explanation:

Given :

Atomic mass of N = 14 u

Atomic mass of H = 1 u

Procedure :

Mass of NH3 = mass of N + (3 × mass of H)

=> Mass of NH3 = 14 u + 3u

=> Mass of NH3 = 17 u.

This above is the molecular mass of NH3.

For 1 mole => 17 u

Hence for 0.5 mole => 17 u × 0.5 m

Hence the mass of 0.5 moles of NH3 = 17/2 u (OR) 8.5 u.

Thanks !

Answer 2

Answer:

8.5

Step-by-step explanation:

Molar mass of NH3 = 14g +3×1g

=17g

Number of moles=0.5

Number of moles= mass /molar mass

0.5= mass/17g

0.5×17g=mass

8.5g =mass