1) Use the following percent composition data to find the empirical formula of t

Question

1) Use the following percent composition data to find the empirical formula of the molecule (refer to the combustion, or percent composition, examples in your lab manual if you do not recall how to work through these types of problems) a) Compound A Element: % Ratio mpirical Formul C 88.82 11.18 . b) If the molecular mass of Compound A is 108.184 g/mol, what is the chemical formula? c) Compound C Element: Ratio mpirical Formul C 40.00 6.71 53.28 d) The13C NMR of Compound C has 5 distinct signals (peaks), what is the most likely chemical formula of Compound C?

Explanation / Answer

1)

compound A:

C : H

88.82 / 12 : 11.18 / 1

7.40 : 11.18

1 :1.5

2 : 3

so emperical formula is C2H3.

let molecular formula is (C2H3)n

so

n (12 * 2 + 1 *3) = 108.184

n = 4

so molecular formula is C8H12.

b)

compound C:

C : H : O

40.0 / 12 : 6.71 / 1 : 53.28 /16

3.33 : 6.71 : 3.33

1 : 2 : 1

so empirical formula is CH2O.

as 13 C have five distinct caron,

so molecular formula of compound C is (CH2O)5 = C5H10O5.

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