We have to calculate the pressure of oxygen gas in the cylinder under the given conditions.

**We will solve this problem through these steps:**

**Step 1:** Calculate the number of moles of oxygen gas.

**Step 2:** Calculate the pressure of oxygen gas in cylinder using the ideal gas equation.

**Step 1:** Calculate the number of moles of oxygen gas.

Number of moles of substance can be calculated by this formula:

$\overline{){\mathbf{moles}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}\frac{\mathbf{mass}}{\mathbf{molar}\mathbf{}\mathbf{mass}}}$

What is the pressure in a 21.0-L cylinder filled with 40.1 g of oxygen gas at a temperature of 331 K ?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the The Ideal Gas Law concept. You can view video lessons to learn The Ideal Gas Law. Or if you need more The Ideal Gas Law practice, you can also practice The Ideal Gas Law practice problems.