Question

What is the temperature at which the kinetic energy of $0.3$ moles of helium is equal to the kinetic energy of $0.4$ moles of argon at $400K$?

• A. $400K$
• B. $873K$
• C. $533K$
• D. $300K$

Answer 1

The correct option is C $533K$

Kinetic Energy of n moles = (3/2)nRT

R = gas constant , T = temperature

⇒ n1T1 = n2T2 or n HeTHe = nArTAr

Put the value of nHe = 0.30 nAr = 0.40 TAr = 400 K in the formula, we get

THe = 533 K

Option C is correct answer