11. A 5.73-L flask at 25 °C contains 0.0388 mol of N2.0.147 mol of Co, and 0.0803 mol of Hz.
What is the total pressure in the flask in atmospheres?

Explanation:

The identity of the gases doesn't matter. All we need is the total number of moles.

1. Total number of moles

N₂  0.0388 mol

CO  0.147

H₂   0.0802

      0.266   mol

2. Other data

V = 5.73 L

T = 25 °C

3. Total pressure

We can use the Ideal Gas Law:

pV = nRT

Calculations:

(a) Convert the temperature to kelvins

T = (25 + 273.15) K = 298.15 K

(b) Calculate the pressure

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