A sample of helium gas occupies a weather balloon with a volume of 793.4 mL, pressure of 764 Torr and at a temperature of 13 °C. How many moles of helium gas are in the balloon? Express your answer to the correct number of significant figures and include the unit 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.