The value of universal gas constant is $8.3 J / m o l e$ - $K$ . The mean kinetic energy of 32 gm of oxygen at $- 736 \circ C$ will be:

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Solution

no. of moles of $O_{2}$ in $32 g = \frac{32}{32} = 1 m o l e$ .
$K . E = \frac{3}{2} n R T T = 736^{\circ} C = - 463 K$
$K . E = \frac{3}{2} \times 1 \times 0.3 J / m o l - K \times (- 463) K = - 5.764 K J$

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8.3 J / m o l e / K

32 g m

- 73^{o} C

The value of universal gas constant is 8.3 J/mole/K, the mean kinetic energy of 32 gm of oxygen at $- 73^{\circ} C$ will be

8.3 j o u l e m o l^{- 1} K^{- 1}

6 \times 10^{23}

327^{\circ} C

14 g

32 g m

300 K ?

[R = 8.3 J / m o l - K]

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