A lighter-than-air balloon contains 1005 mol helium at1.00 atm and 25.0°C.(a) Compute the difference between the mass of the     helium it contains and the mass of the air it displaces,     assuming the molar mass of air to be 29.0 g mol-1 .(b) The balloon now ascends to an altitude of 10 miles,     where the temperature is - 80.0°C. The walls of the    balloon are elastic enough that the pressure inside it    equals the pressure outside. Repeat the calculation of    part (a).

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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.