Q. A certain amino acid has the following elemental composition: C, H, O, N. In a...

Q. A certain amino acid has the following elemental composition: C, H, O, N. In a combustion analysis, 3.263g of it was combusted to produce 5.910g of CO2 and 2.835g of H2O. Separate analysis determined that it is 19.17% N, and its molar mass is 150g/mol. Determine its empirical and molecular formula.

Solutions

Expert Solution

Step 1) Determine the mass of C, H, O and N

Carbon:

= 1.613 g

Hydrogen :

= 0.3175 g

Nitrogen =

=0.626 g

mass of Oxygen = Mass of compound -(mass of C + H+N)

Mass of O = 3.263 - (1.613 +0.626+0.3175) =0.7065 g

Step 2) Percentage of C, H, N and O

percentage of C =

C =49.43%

percentage of H =

H =9.73%

Percentage of N =19.17%

Percentage of O =

O=21.65%

Step 3) Determine empirical formula

queen_honey_blossom answered 1 year ago

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