Question

calculate the number of moles in 15 liters of oxygen at stp.
0.67 mol
67 mol
360 mol
1.5 mol

Explanation:

Step1: Recall molar - volume at STP

At STP (Standard Temperature and Pressure), 1 mole of any ideal gas occupies 22.4 L.

Step2: Set up the proportion

Let $n$ be the number of moles of oxygen. We have the proportion $\frac{n}{15\ L}=\frac{1\ mol}{22.4\ L}$.

Step3: Solve for $n$

$n=\frac{15\ L}{22.4\ L/mol}\approx0.67\ mol$

Answer:

0.67 mol