JEE Main · 2022 · 25 Jun 2022 · Shift 2 · Polymers

The Novolac polymer has mass of 963 g. The number of monomer units present in it are ______.

Answer: 9

Solution

Novolac is the linear phenol-formaldehyde polymer in which the phenol rings are joined by methylene bridges, so one repeating unit consists of a single aromatic ring bearing the hydroxyl group together with one

- C H_{2} -

link, namely

C_{7} H_{6} O

, of molar mass

7 (12) + 6 (1) + 16 = 106 g mo l^{- 1}

. Dividing the polymer's mass by the mass of one repeating unit gives

\frac{963}{106} \approx 9

, so the chain is built from

9

monomer units.

JEE Main · 2022 · 25 Jun 2022 · Shift 2 · Integer answer

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