A 9.79 mol sample of freon gas was placed in a balloon. Adding 3.50 mol of freon gas to the balloon increased its volume to 21.8 L. What was the initial volume of the balloon?

16.06 L was the initial volume of the balloon.

Explanation:

Initial moles of freon in ballon =

Initial volume of freon gas in ballon =

Moles of freon gas added in the balloon = n = 3.50 mole

Final moles of freon in ballon =

Final volume of freon gas in ballon =

Using Avogadro's law:

( at constant pressure and temperature)

16.06 L was the initial volume of the balloon.

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10 years is the answer