Question

8. Find number of molecules, space occupied by one
molecule and distance between the molecules in a gas of
volume 1.00 cm at NTP ?

Ans. 2.68 x 1019.3.73 x 10-26 m?. 3.34 x 10-9
[Hint : Number of molecules of I gm at NTP
= 6.02 x 1023 moles
m​

Answer 1

Answer:

The ideal gas equation relating pressure (P), volume (V), and absolute temperature (T) is given as:

PV = nRT

Where,

R is the universal gas constant =8.314Jmol

−1

K

−1

n = Number of moles = 1

T = Standard temperature = 273 K

P = Standard pressure = 1 atm =1.013×10

5

Nm

−2

∴V=nRT/P

=1×8.314×273/(1.013×10

5

)

=0.0224m

3

=22.4 litres

Hence, the molar volume of a gas at STP is 22.4 litres.