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Gas Law Lab

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The goal of the experiment is to determine the molar mass of an unknown liquid using the Ideal Gas Law and once it is found the empirical and molecular formula could be determine. The theory behind this experiment is the idea that if the pressure, volume, number of moles and temperature are all constant we could easily use the Ideal gas law equation to find the molar mass of a gas. obtain this information we would need to heat up and unknown liquid in a closed flask in boiling water and once the liquid has evaporated the volume and mass is calculated. The values obtained once completing this experiment is 103 g/mol as the molar mass and CH2 for the empirical formula and C7H14 for the molecular formula. The molecular formula allows to know the number of moles for each element. Introduction The Ideal Gas Law is gas law that allows us to calculate the molar mass of gasses if all the terms are given (i.e. pressure, volume, temperature in kelvin, mass). In the Ideal Gas Law equation these terms must all be constant for a gas to be ideal. For a gas to be ideal the must follow all of the following gas laws; Boyle’s law, Charles’s Law and Avogadro’s Laws. …show more content…

Boyle’s law which states the relation between the pressure and the volume of a gas is inversely proportional; P1V1=P2V2, this is combined with Charles’s law which proves the relation between the volume and the temperature of a gas are proportional; V1/T1=V2/T2 and a third law called Avogadro’s law which describes the relation between the volume and the number of moles of a gas: V1/n1=V1/n1 to formulate the following Ideal gas Law; PV=nRT. Since we know the following formula: n= mass/molar mass, the Ideal Gas Law equation can be rearranged to M=

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