The ratio between the root mean square speed of H_{2} at 50 K and that of O_{2} at 800 K is:

- a)4
- b)2
- c)1
- d)¼

Correct answer is option 'C'. Can you explain this answer?

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2 Answers

Aman Thakur
answered
May 29, 2018

Expression of rms is : urms = √(3RT/M) ⇒ (u_rms (H_2 at 50 K))/(u_rms (O_2 at 800 K) ) = √((3R x 50)/2)/√((3R x 800)/32) = √(50/2 x 32/800) = 1

Bharti Lekhwar
answered
Sep 10, 2018

The formula for finding rms speed of molecules is given by square root of 3RT/M and R is constant and M for hydrogen is 2 and that for oxygen is 32 and temperatures are given in the ques,, u can find out the ratio it will gives u the answer c

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