A weather balloon is inflated to a volume of 26.8L at a pressure of 749mmHg and a temperature of 24.

A weather balloon is inflated to a volume of 26.8 L at a pressure of 749 mmHg

and a temperature of 24.7 C. The balloon rises in the atmosphere to an altitude where the pressure is 375 mmHg and the temperature is -13.3 C

.

Assuming the balloon can freely expand, calculate the volume of the balloon at this altitude.