Skill 3-5 contd: Vitamin C (M= 176. g/mol) contains C, H and O. A 1.000 g sample was placed in a combustion apparatus:
Plan: -Use changes in mass of CO 2 and H 2O absorbers to calculate the moles of C and H present in the sample.
-Find the mass of C, using the mass fraction of C in CO 2 . Likewise, find the mass of H from the mass of H2O.
-The mass of vitamin C minus the sum of the C and H masses gives the mass of O.
-Construct the empirical formula and molecular formula.
23
What is the molecular formula of vitamin C?
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