The mass of $\mathrm{NH}_{3}$ produced when 131.8 kg of cyclohexanecarbaldehyde undergoes Tollen's test is $\_\_\_\_$ kg. (Nearest Integer) Molar Mass of $\mathrm{C}=12 \mathrm{~g} / \mathrm{mol}$ $\mathrm{N}=14 \mathrm{~g} / \mathrm{mol}$ $\mathrm{O}=16 \mathrm{~g} / \mathrm{mol}$

JEE Main · 2023 · 12 Apr 2023 · Shift 1 · Aldehydes Ketones and Carboxylic Acids

The mass of

NH_{3}

produced when 131.8 kg of cyclohexanecarbaldehyde undergoes Tollen's test is

____

kg. (Nearest Integer)

Molar Mass of

C = 12 g / mol

N = 14 g / mol

O = 16 g / mol

Answer: 60

Cyclohexanecarbaldehyde,

C X_{6} H X_{11} CHO

, has a molar mass of

112 g mol^{- 1}

. In Tollen's test the aldehyde is oxidised by the diamminesilver(I) reagent:

C X_{6} H X_{11} CHO + 2 [Ag (NH X_{3}) X_{2}] OH C X_{6} H X_{11} COONH X_{4} + 2 Ag + 3 NH X_{3} + H X_{2} O

The two complex ions supply four ammonia molecules; one is retained as the ammonium ion of the carboxylate salt, so three

NH X_{3}

molecules are set free for each mole of aldehyde.

n_{aldehyde} = \frac{131.8 \times 1 0 ^{3}}{112} = 1176.8 mol

n_{NH X_{3}} = 3 \times 1176.8 = 3530.4 mol

m_{NH X_{3}} = 3530.4 \times 17 = 6.0 \times 1 0^{4} g

The mass of ammonia produced is 60 kg.

JEE Main · 2023 · 12 Apr 2023 · Shift 1 · Integer answer