a) The densities of air at −85 °C, 0 °C, and 100 °C are 1.877 g dm−3, 1.294 g dm−3, and 0.946 g dm−3, respectively. From these data, and assuming that air obeys Charles’ law, determine a value for the absolute zero of temperature in degrees Celsius. b) A certain sample of a gas has a volume of 20.00 dm3 at 0 °C and 1.000 atm. A plot of the experimental data of its volume against the Celsius temperature, θ, at constant p, gives a straight line of slope 0.0741 dm3 °C−1. From these data alone (without making use of the perfect gas law), determine the absolute zero of temperature in degrees Celsius.

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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.