A spherical party balloon is filled with helium until it is 50.0cm in diameter, when it is then tied off. The atmospheric pressure on the day it is filled is 95.0 kPa and the air temperature is 22.0°C. 50cm (a) Assuming the balloon is a perfect sphere (V = πr³), calculate the number of helium atoms present in the balloon under these conditions.

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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.