<h2>T
he new volume of the balloon at the top of Pikes Peak is 10.2 L</h2>
Explanation:
Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.
The combined gas equation is,

where,
 = initial pressure of gas = 577.0 torr
 = initial pressure of gas = 577.0 torr
 = final pressure of gas = 400 torr
 = final pressure of gas = 400 torr
 = initial volume of gas = 7.4 L
 = initial volume of gas = 7.4 L
 = final volume of gas = ?
 = final volume of gas = ?
 = initial temperature of gas =
 = initial temperature of gas = 
 = final temperature of gas =
 = final temperature of gas = 
Now put all the given values in the above equation, we get:


Thus the new volume of the balloon at the top of Pikes Peak is 10.2 L
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