Benzoic acid is treated separately with two reagents.
PhCOOH + NaNH₂ $\to$ PhCOO⁻Na⁺ + gas A
PhCOOH + NaH $\to$ PhCOO⁻Na⁺ + gas B
If A and B are the molar masses of the two gases, find the value of A + B - 10.

Question

Benzoic acid is treated separately with two reagents.

structure

PhCOOH + NaNH₂ $\to$ PhCOO⁻Na⁺ + gas A

PhCOOH + NaH $\to$ PhCOO⁻Na⁺ + gas B

If A and B are the molar masses of the two gases, find the value of A + B - 10.

TestHub · Accepted Answer

NaNH₂ is deprotonated by the carboxylic acid, releasing ammonia : gas A = NH₃, molar mass 17. NaH is deprotonated by the acid, releasing hydrogen : gas B = H₂, molar mass 2. A + B - 10 = 17 + 2 - 10 = 9.

Chemistry - GOC Question with Solution | TestHub

Doubts & Discussion