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== == == == Standard temperature and pressure (STP), as defined by IUPAC, is 0 degrees Celsius (273 Kelvin) and 1 atmosphere of pressure.

Use the ideal gas law:

P V = n R T

where P is pressure in atmospheres, V is volume in liters, n is moles of gas, R is the universal gas constant, and T is temperature in Kelvin.

(1) (44.8) = n (0.0821) (273)

Substitute values in, and solve for moles.

n = approximately 1.9988132 moles.

With this new information, we can get our answer.

Multiply moles by oxygen's molar mass. In our case, this value is 32, as oxygen gas exists in diatomic molecules (meaning there's two oxygen atoms per molecule).

1.9988132 * 32 = 63.9620224 grams of oxygen.

Here is your answer. Apply significant figures as necessary. Look at the related question, "How do you solve Ideal Gas Law problems?" for more information. Credit for that answer goes to JEK, as of this writing.

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