A weather balloon is filled with helium at STP. It is later launched on a clear day when the temperature is 29.0 °C and the atmospheric pressure is 766 torr.  When the balloon was filled at STP, its volume was 75.0 L.  What is the volume of the weather balloon at launch?  Express your answer to the correct number of significant figures, and include units with your answer.

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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.