Multiple choice

The specific heat of argon at constant volume is 0.075 kcal/kg K. Calculate the atomic weight. [Given: R = 2cal/mol K]

  1. 40 gm/mole

  2. 53.33 gm/mole

  3. 17.77 gm/mole

  4. 0.225 gm/mole

  5. 0.1 gm/mole
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A Correct answer
Explanation

As argon is monatomic, its molar specific heat at constant volume will be Cv= (3/2)R = (3/2)2 = 3 cal/mol K Now as Cv = Mcv with Cv = 0.075 cal/gk              3 = M x 0.075          Mw = 3 / 0.075                =  40 gm/mole

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