Density of a gas often reflects its isotopic composition. Consider a gas sample containing H2 and HD mixed in a 1000 cm3 container. The gas weighs 0.1105 g at standard temperature and pressure. Determine the mol percentage of HD in the sample. (Assume ideal gas behavior for both HD and H2)

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Q: Why is the mole an important unit to chemists?

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Q: calculate the number of atoms of F in 32.5g of flourine gas, F2

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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.