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24 May, 13:29

Compute the root-mean-square speed of a nitrogen molecule at 79.8°C. The molar mass of nitrogen molecules (N2) is 28.0*10-3 kg/mol. At what temperatures will the root-mean-square speed be (b) 1/2 times that value and (c) 2 times that value?

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  1. 24 May, 13:36
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    Vrms = 560.462 m/s

    temperature is 88.2 K

    temperature = 1411.2 k

    Explanation:

    Given data

    temperature = 79.8°C = 79.8 + 273 = 352.8 K

    (N2) = 28.0 * 10^-3 kg/mol

    to find out

    temperatures and 1/2 times that value and 2 times that value

    solution

    we know velocity rms formula that is

    Vrms = √ (3RT/m)

    here R = 8.31 and T = 352.8 and m = 28.0*10^-3

    so Vrms = √ (3 (8.31) 352.8 / 28*10^-3)

    Vrms = 560.462 m/s

    and

    for 1/2 Vrms

    we know as V is proportional to square root of temperature

    so it will be 1/2th if temperature is made 1/4th

    so t/4 = 352.8 / 4 = 88.2 K

    so temperature is 88.2 K

    and

    if it will be 2 times if temp is made 4 time

    temperature = 4 (352.8)

    temperature = 1411.2 k
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