Question

how many moles of cl₂ are in a container with a volume of 7.5 l at stp?

Explanation:

Step1: Recall STP molar volume

At STP, 1 mole of any ideal gas occupies 22.4 L.

Step2: Calculate moles of $\text{Cl}_2$

Use the ratio: $\text{Moles} = \frac{\text{Given Volume}}{\text{Molar Volume at STP}}$
Expression: $\text{Moles of } \text{Cl}_2 = \frac{7.5}{22.4}$

Step3: Compute the value

Perform the division: $\frac{7.5}{22.4} \approx 0.33$

Answer:

Approximately 0.33 moles of $\text{Cl}_2$