The monomer $(\mathbf{X})$ involved in the synthesis of Nylon 6,6 gives positive carbylamine test. If 10 moles of $\mathbf{X}$ are analyzed using Dumas method, the amount (in grams) of nitrogen gas evolved is ____. Use: Atomic mass of N (in amu) = 14

JEE Advanced · 2025 · 18 May 2025 · Paper 1 · Practical and Analytical Chemistry

The monomer

(X)

involved in the synthesis of Nylon 6,6 gives positive carbylamine test. If 10 moles of

X

are analyzed using Dumas method, the amount (in grams) of nitrogen gas evolved is ____.

Use: Atomic mass of N (in amu) = 14

Answer: 280

Nylon 6,6 is synthesized from hexamethylene diamine and adipic acid. The monomer that gives a positive carbylamine test is hexamethylene diamine,

H_{2} N - (CH_{2})_{6} - NH_{2}

(molecular formula

C_{6} H_{16} N_{2}

).

In the Dumas method:

C_{6} H_{16} N_{2} + excess CuO \to 6 CO_{2} + 8 H_{2} O + N_{2}

1 mole of hexamethylene diamine produces 1 mole of

N_{2}

.

From 10 moles of hexamethylene diamine:

JEE Advanced · 2025 · 18 May 2025 · Paper 1 · Numerical answer