chemistry

I am looking at the material in the text over and over and cannot understand this!........help,how do I figure this out?

Find the volume occupied by 0.500 mole He at STP .

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  1. Two procedures:
    1. You know that 1 mole of any gas (an ideal gas) occupies 22.4 L at STP; therefore, 22.4 L x 0.5/1 = ?? OR

    2. Use PV = nRT
    P is 1 atm, V is the unknown, n = 0.5, you know R and T is 273.
    The answer should be the same for both methods.

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