Which of the following molecules has the largest root mean square velocity at 25°C

Which Of The Following Molecules Has The Largest Root Mean Chemistry QuestionWhich Of The Following Molecules Has The Largest Root Mean Chemistry Question

Which of the following molecules has the largest root mean square velocity at 25°C

Options

(a) NH₃
(b) SO₂
(c) H₂S
(d) CO₂

Correct Answer:

NH₃

Explanation:

Temperature= 25⁰C, R.M.S velocity (ν r.m.s) = √(3RT / M ) ∝ √(1/M) .
(where M is molecular weight). We also known that molecular weights of SO₂, CO₂, NH₃, H₂S are 64 , 44 , 17 , 34 respectively .Therefore NH₃ molecule has the largest root mean square velocity, because of the least molecular weight.

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