Problem 4

A mixture contains two organic compounds, A and B, both containing oxygen and miscible in all proportions. Controlled oxidation of this mixture yields a single compound C, which forms an addition compound with

\ce{NaHSO3}

. The molar mass ratio of this bisulfite adduct to compound C is 2.7931. Burning the mixture of A and B with a stoichiometric amount of air (20 %

\ce{O2}

, 80 %

\ce{N2}

by volume) yields a gas mixture of total volume 5.432 dm

^3

at STP. When bubbled through

\ce{Ba(OH)2}

solution, the volume decreases by 15.46 %. (a) Identify compounds A, B and C. (b) Calculate the molar ratio of A and B in the initial mixture. (

A_r(\text{C}) = 12

A_r(\text{O}) = 16

A_r(\text{S}) = 32

A_r(\text{Na}) = 23

)

Step 4 of 4: Molar ratio

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\dfrac{n(\text{A})}{n(\text{B})} = \dfrac{x}{y} = \dfrac{0.0025}{0.0100} = \dfrac{1}{4}

Analysis

The molar ratio of propan-2-ol to acetone in the initial mixture is $1 : 4$ .