1.

An ideal gas at room temperature has 105 molecules per cubic centimetre. Its pressure is of the order of (a) 10-15 atm (b) 10-10 atm (c) 10-5 atm (d) 1 atm 

Answer»

Correct Answer is (a) 10-15 atm 

 p = nkT = (105 x 106 m-3) (1.38 x 10-23 J K-1) (300 K)

≃ 10-10 N m-2 = 10-10 pa  10-15 atm.



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