Find the number of moles of ammonia gas taken when the kinetic energy change of the gas sample is 6250 J and change in temperature is given as 400 K.
A
0.75
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B
0.52
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C
0.63
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D
0.85
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Solution
The correct option is C 0.63 Since, we know ΔK.E.=f2nRΔT where ΔK.E= change in kinetic energy of the gas n = number of moles of gas We know, f = degree of freedom for a polyatomic gas = 6 ΔK.E=62×n×8.314×ΔT So, 6250=62×n×8.314×400 On solving, n = 0.63