A balloon filled with oxygen gas occupies a space of 6.9 L at 45 C. What will the volume of the gas be if the temperature is increased to 80 C?

The volume of a sample of oxygen is 300.0 mL when the pressure is 1.00 atm and the temperature is 27.0°C. At what temperature is the volume 1.00 L and the pressure 0.500 atm?
If the temperature remains constant, V and P represent the original volume and pressure, and V' and P' represent the new volume and pressure, what is the mathematical expression for Boyle's law?
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