Question

Select the correct observation for a 8.21 lit container, filled with 2 moles of He at 300 K, 

(A) It has pressure 6 atm 

(B) If it is an open rigid container, its pressure increases to 8 atm on heating to 400 K 

(C) If it is closed non-rigid (like thin skin balloon), its volume increases to 16.42 lit. on heating to 600 K 

(D) When connected with another similar empty container maintained at 150 K while maintaining original container at 300 K, pressure reduces to 2/3 atm.

Answer 1

Correct Option   (A, D)

Explanation:

 V = 8.21 l, n = 2 moles T = 300 K

If the container is open

Then P ∝ nT and P ∝T ( is wrong) hence statement B is incorrect

Similarly if container is closed-non-rigid. PV ∝ T and not V ∝ T

If another container is introduced , P must be same