A 2.25-m3 (cubic meters) weather balloon is filled with 372 g of helium gas at 22.0oC. The balloon rises to an altitude where the atmospheric pressure and temperature are 405 torr and -20oC, respectively. Assuming that the balloon is made of a very elastic and stretchable material, calculate the volume of the balloon at this altitude?           (A) 7.25 m3          (B) 4.22 m3          (C) 3.62 m3          (D) 2.11 m3

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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.