Asked by Some kid.
The relative molecular mass of A is 116. Determine the molecular formula for A.
Answers
Answered by
DrBob222
What's the empirical formula?
Calculate the empirical molar mass (by adding the atomic masses of the elements). Let's just suppose CxHyOz = 57. So divide 116/57 = 2.03. Round that to a whole number (the relative molar masses are usually done by a procedure that gives only approximate molar masses) which in this case is 2. That means the empirical formula is 1/2 the molecular formula; i.e., (CxHyOz)2 = molecular formula. Then you can add the atomic masses to obtain an exact molar mass.
Calculate the empirical molar mass (by adding the atomic masses of the elements). Let's just suppose CxHyOz = 57. So divide 116/57 = 2.03. Round that to a whole number (the relative molar masses are usually done by a procedure that gives only approximate molar masses) which in this case is 2. That means the empirical formula is 1/2 the molecular formula; i.e., (CxHyOz)2 = molecular formula. Then you can add the atomic masses to obtain an exact molar mass.