Calcium perbromate, Ca(BrO4)2 (m.w.= 327.9 g/mol) decomposes upon heating to release oxygen gas according to the equation below.  A sample containing Ca(BrO4)2 is heated and the  gas produced collected by downward displacement of water at 50.0°C.  The total volume of gas collected was 438.0 ml at an atmospheric pressure of 680.0 torr. How many grams of Ca(BrO4)2 were in the original sample? Calculate the mole fraction of oxygen gas in the collected gas mixture.

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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.