# A football has a diameter of 22 cm. It is inflated to 1 atm pressure above normal atmospheric pressure on a sunny summer day when the temperature was 25C. Take normal atmospheric pressure to be 101.3 kPa. What mass of air is contained in the ball?

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See below. The answer is about

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We are going to use the formula(the ideal gas law)

Then, what is the value of the variants?

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(I interpreted "inflated to 1 atm pressure above normal atmospheric pressure" to be 2 atm. If this is wrong, let me know.)

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Plug in these values to the formula.

The avarage molar mass of the air is

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