A sample of a compound has a total mass of 200.0 g. Phosphorus comprises 87.28 g of the sample while oxygen comprises 112.72 g. a. Find the percent mass of phosphorus and oxygen in the sample. b. Find the empirical formula of the compound. c. If the compound has a molar mass of 283.88 g/mol, what is the molecular formula?

Q: How many molecules (units) are in 3.50 moles of H2SO4 ? Information that may be useful: H: mass…

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Q: What is the empirical formula for the substance in the figure?   A. S2O6 B. S3O C. SO3 D. SO

A: Given ,  %S= 40.05 % Therefore, %O = 100-40.05 =59.95 %

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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.