Question

What is the empirical and molecular formula ? What is the molecular weight ?

Computer Unknown # 9 Physical Properties MP 206-210 °C White solid C 77.86 % H=11.76 % Sodium Fusion Test A purtion of the sodium fusion filtrate was treated with ferrous sulfate and heated. It was then acidified with dilute sulfuric acid. No obeervable change was noticed. Another portion of the sodium fusion filtrate was treated with lead acetate. No observable change was noticed. Another portion was acidified and silver nitrate added. No observable change w noticed. Solubility Tests Key (-) water Insoluble soluble slightly soluble soluble hot 5% hydrochloric acid 5% Bodium bicarbonate (-) (-) (-) (+. 5% sodium hydroxide (h) becomes cloudy conc sulfuric acid Classification Tests Beilstein Test A yellow and blue flame is observed Combustion-A blue flame is observed 2,4-DNP- No reaction observed Tollens Test- No reaction is observed Lucas Test - The unknown was not soluble in the reagent Jones Reagent (Chromic Acid Test) After about 3 seconds a-green precipitate appear Potassium permagan ate test - The purple color is discharged and a brown precipitate of manganese dioxide appears. Iodoform Test - The solution becomes cloudy but no precipitate is formed Bromine in methylene chloride - The reddish color persists after about three drops are added to the unknown Silver nitrate test No reaction is observed after about five minutes. Acetyl Chloride test A great deal of heat is formed when water is added, a white precipitate is formed

Answer 1

Empirical formula A chemical formula showing or giving the simplest ratio of the elements in a compound, But not actual number of atoms in the the molecule. Ext we know that the molecular formula of glucose is GHI 26. ledna But the empirical formula of glucose can be represented as CH₂O حد تم Molecular Formular Molecular formula represents the totale number of elements present in a compound Ex: The molecular formula of ethane is - Cato molecular weighting molecular weight of the compound is depends on the molecular formula of the compound. Definition of molecular weight can be explained by below example Ex: The molecular formula of ethane is Ca Ho. Now we have to find the molecular weight 1 The Delini of the Ca Ho

First of all we can know the Atomic weight of carbon and hydrogen flori the periodic table a t that are Atomic weight of carbon = 12.01 Atomic weight of hydrogen alool molecular weight = (Number of carbon atoms) ç atomic weight) 1 + (number of Hydrogenatoms) C CH atomic weight) since a te contains two carbons and six hydrogens. Molecular weight = (2) (12001) + 6(1.01) = 24.02 + 6-06 : = 30-03 But the white of molecube weight are amu 2. Molecular weight of ethane is 30:08ami