1. Convert Celsius to Kelvin:
* Temperature (K) = Temperature (°C) + 273.15
* Temperature (K) = 20°C + 273.15 = 293.15 K
2. Use the Ideal Gas Law:
* The Ideal Gas Law is: PV = nRT
* P = Pressure (in atmospheres)
* V = Volume (in liters)
* n = Number of moles
* R = Ideal gas constant (0.0821 L·atm/mol·K)
* T = Temperature (in Kelvin)
3. Rearrange the equation to solve for P:
* P = (nRT) / V
4. Plug in the values:
* P = (0.108 mol * 0.0821 L·atm/mol·K * 293.15 K) / 0.505 L
5. Calculate the pressure:
* P ≈ 5.24 atm
Therefore, the pressure of the helium gas is approximately 5.24 atmospheres.
