Question

If 3 moles of NH3 dissociates . Calculate the mass and volume ( at STP ) of N2 and H2 formed ?

Answer 1

2NH3 = N2 + 3H2

MASS--

Mole=3

mole=mass given/molar mass

Let mass be x;

mass of N2

3 = x/28

mass=28*3=84g

mass of 3H2-

3 = x/6

x= 18g whereas for H2

3 = x/2

x = 6g

Let volume be v;

for N2-

mole = volume given/volume at S.T.P(22.4L)

3 = v/22.4

v= 67.2 L

for H2-

3 = v/22.4

v = 67.2 L

whereas for 3H2

= 67.2*3

v = 202.6 L

Hope it will help you..