Chemistry - AMINES Question with Solution | TestHub

Question Explanation:

The question asks for the mass (in grams) of the major product Q obtained from a given volume and density of the starting material P (aniline), considering the reaction sequence which is an Azo coupling reaction , and a specified overall reaction yield of 75% .

Concept:

Stoichiometry, Limiting Reactant, Percentage Yield, Azo Coupling Reaction

Solution:

Molecular weight of aniline (C₆H₇N) = 72 + 7 + 14 = 93

Density of P = 1 gm ml^-1

Mass of  Moles of P  = Volume × Density = 9.3 ml × 1.00 g/ml = 9.3 gm

mole of P = $\frac{9.3}{9.3}=1mole$

The mole ratio  $PhN{H}_2$ : $Ph{N}_2^{+}$ :

1 : 1 : 1

so the mole of Q formed will be 0.1 mole and extent of reaction is 100% but if it is 75% yield.

Then amount of Q = 0.1 × $\frac{75}{100}$=0.075 mol

The molecular formula of Q = C₁₆H₁₂ON₂

So, molecular weight of Q = 16 × 12 + 12 × 1 + 16 + 2 × 14                                          

= 192 + 12 + 16 + 28                                          

= 248 gm

So amount of Q = 248 × 0.075                          

= 18.6 gm