A balloon contains 30.0 L of helium gas at 1.00 atm. What is the volume of the helium when the balloon rises to an altitude where the pressure is only 0.250 atm? Assume that the temperature remains constant.

The volume of that ballon would be approximately at a pressure of .

Explanation:

Let and be the volume and pressure of the gas before the change.

By Boyle's Law, the volume of an ideal gas is inversely proportional to its pressure. In other words, if and represent the volume after the change, then .

In this case,

The value of needs to be found. Rearrange the equation :

.

Therefore,

.

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