JEE Main · 2022 · 27 Jul 2022 · Shift 2 · Aldehydes Ketones and Carboxylic Acids

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In the above reaction, 5 g of toluene is converted into benzaldehyde with 92% yield. The amount of benzaldehyde produced is ____

\times 1 0^{- 2}

g. (Nearest integer)

Structure Reaction scheme — Reaction scheme

Answer: 530

Solution

The reaction converts toluene (

C X_{7} H X_{8}

, molar mass = 92 g/mol) to benzaldehyde (

C X_{7} H X_{6} O

, molar mass = 106 g/mol) in a 1:1 molar ratio.

Step 1: Calculate moles of toluene

Moles of toluene = \frac{5}{92} mol

Step 2: Calculate moles of benzaldehyde (with 92% yield)

Moles of benzaldehyde = \frac{5}{92} \times \frac{92}{100} = 5 \times 1 0^{- 2} mol

Step 3: Calculate mass of benzaldehyde

Mass = 106 \times 5 \times 1 0^{- 2} = 5.3 g = 530 \times 1 0^{- 2} g

Therefore, the answer is 530.

JEE Main · 2022 · 27 Jul 2022 · Shift 2 · Integer answer

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