Question

A gas sample occupies 8.77 L at 20 degrees Celsius and 3.98 atm. What is

the amount of mols of gas in the sample? *

Answer 1

1.45 mol

Step-by-step explanation:

Given data

• Volume of the gas (V): 8.77 L

• Temperature of the gas (T): 20 °C

• Pressure of the gas (P): 3.98 atm

Step 1: Calculate the absolute temperature (Kelvin)

We will use the following expression.

`K = \°C + 273.15\\K = 20\°C + 273.15 = 293K`

Step 2: Calculate the number of moles (n) of the gaseous sample

We will use the ideal gas equation.

`P * V = n * R * T\\n = (P * V)/(R * T) = (3.98atm * 8.77L)/((0.0821atm.L)/(mol.K) * 293K) = 1.45 mol`