Question

Calculate the volume occupied by 3.2 grams of Oxygen at 76 cm of Hg at 27 and also calculate the average kinetic
energy of a molecule of the gas.

Answer 1

that's STP. so, do the normal calculation.
22.4 litres occupied by 32 grams of oxygen gas.
therefore the answer will be 2.24 litres

Answer 2

Answer:

Volume occupied by the volume is 2.46 L.

Average kinetic energy of oxygen gas molecule is $6.21\times 10^{-23} J$

Explanation:

Pressure of the oxygen gas,P = 76 cmHg=760 mmHg = 1 atm

Moles of oxygen gas ,n=$\frac{3.2 g}{32 g/mol}=0.1 mol$

Temperature of the oxygen gas = 27°C = 300 K

Volume occupied by the oxygen = V

$PV=nRT$

$V=\frac{0.1 mol\times 0.0820 atm L/mol K\times 300 K}{1 atm}=2.46 L$

Average kinetic energy of oxygen gas molecule:$\frac{3K_b\timesT}{2}$

$E=\frac{3\times 1.380\times 10^{-23}J /K\times 300 K}{2}=6.21\times 10^{-23} J$