CHM110H5 Lecture Notes - Lecture 2: Barium Chloride, Sodium Chloride, Molality
Document Summary
Find the atomic mass and identity of an element: when 1. 42g of m2so4 were dissolved in water and treated with excess aqueous bacl2, all of the sulfate precipitated as baso4. M: atomic mass of m = 23 g/mol, na2so4 thus na is m. Find the empirical formula of vitamin c: a 6. 49 mg sample of ascorbic acid which is known to contain only c, h, and o was burned in a combustion apparatus. The increased weights of the absorption tubes showed that 9. 74mg of co2 and 2. 64mg of h2o were formed. What is the empirical formula of ascorbic acid (vitamin c): cxhyoz + xss o2 xco2 + 4/2 h2o, 6. 49mg 9. 74mg 2. 64mg, mass of co2 and molar mass can be used to find out the mols of. Co2: 9. 74 x 10-3g/44 g/mol = 2. 2 x 10-4molco2 (x, same thing for h2o, 2. 64x10-3 g /18g/mol = 1. 47 x 10 -4.
