# Calculating Volume of Hydrogen Gas at STP

## Question:

47.9 mL hydrogen is collected at 26° Celsius and 718 torr. What is the volume occupied at STP?

## Answer:

The volume at STP is 41.3 mL.

## Explanation:

**To solve this question, we can use the combined gas law equation:**

P1V1 / T1 = P2V2 / T2

Where:

**P1** = 718 torr

**V1** = 47.9 mL

**T1** = 26°C + 273.15 = 299.15 K

**P2** = 760 torr at STP

**V2** = ?

**T2** = 273.15 K at STP

By substituting the given values into the equation, we can calculate the volume at STP:

718 torr * 47.9 mL / 299.15 K = 760 torr * V2 / 273.15 K

41.3 mL = V2

Therefore, the volume of hydrogen gas at STP is 41.3 mL.