If 3.12 text g of oxygen gas is adsorbed on 1.2 text g of platinum metal, calculate the volume of oxygen adsorbed per gram of the adsorbent at 1 text atm and 300 text K .

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EEJ MAIN Chemistry QUESTION #7180

Question 1

If $3.12 \text{ g}$ of oxygen gas is adsorbed on $1.2 \text{ g}$ of platinum metal, calculate the volume of oxygen adsorbed per gram of the adsorbent at $1 \text{ atm}$ and $300 \text{ K}$.

$1.0 \text{ L}$
$2.0 \text{ L}$✔️
$1.5 \text{ L}$
$2.5 \text{ L}$

Correct Answer Explanation

Calculate total volume of $O_{2}$ using $PV=nRT$:

Moles of $O_{2} = 3.12 / 32 = 0.0975 \text{ mol}$
$V = \frac{0.0975 \times 0.0821 \times 300}{1} \approx 2.4 \text{ L}$
Volume per gram of adsorbent = Total Volume / Mass of Pt
$2.4 \text{ L} / 1.2 \text{ g} = 2.0 \text{ L/g}$

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