A12-liter [l] flask contains 1.3 moles [mol] of an ideal gas at a temperature of 20 degrees celsius [degreesc]. what is the pressure in the flask in units of atmospheres [atm]

Given: Volume of flask=12 L

Number of moles of an ideal gas=1.3 mol

Temperature=20°C

Gas is an ideal gas thus, it follows the ideal gas equation as follows:

Here, P is pressure, V is volume, n is number of moles, R is Universal gas constant and T is temperature.

First convert temperature from °C to K as follows:

Thus,

Rearrange ideal gas equation to calculate pressure,

Putting the values,

Therefore, pressure in the flask will be 2.6 atm.