A weather balloon filled with helium is launched at sea level in California on a clear day when the temperature is 34 °C and the atmospheric pressure is 758 torr (recall 760 torr = 1 atm).  Before launch, the balloon has a volume of 100.0 L.  After the balloon is launched, it rises to 12,000 meters altitude and three hours later, measurements from the balloon at that altitude indicate that the temperature is -41 °C and that the pressure is 468 torr.  Calculate  the new volume (in L) of the balloon at 12,000 meters.

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.