Question

6. How many moles are in a sample of oxygen gas if the pressure is 66.6 kPa, thevolume is 8.25 L, and the temperature is -73°C?

Answer 1

According to the explanation given in a previous session, we will be using again the Ideal gas law formula, which is:

PV = nRT

We have:

P = 66.6 kPa, which is 0.657 atm

V = 8.25 L

n = ?

R = 0.082

T = -73°C, or 200 K

Now adding these values into the formula:

0.657 * 8.25 = n * 0.082 * 200

5.42 = 16.4n

n = 0.33 moles of O2