Question

how many moles of o₂ are in a container with a volume of 67 l at stp?
moles (n)
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Explanation:

Step1: Recall STP molar volume

At STP, 1 mole of gas = 22.4 L.

Step2: Calculate moles of O₂

Moles = Volume / Molar volume = $67\ \text{L} / 22.4\ \text{L/mol}$.

Step3: Compute the result

$67 \div 22.4 \approx 3.0$.

Answer:

3.0