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9.3 g of aniline is subjected to reaction with excess of acetic anhydride to prepare acetanilide. The mass of acetanilide produced if the reaction is 100% completed is _____ × 10^-1 g. (Given molar mass in g mol^-1 N : 14, O : 16, C : 12, H : 1)

1. 135
2. 13.5
3. 1.35
4. 0.135

Correct answer: 135

Solution

The reaction of aniline with acetic anhydride produces acetanilide in a 1:1 molar ratio. Given the molar mass of aniline is approximately 93 g/mol, 9.3 g of aniline corresponds to 0.1 moles, resulting in 13.5 g of acetanilide, which is equivalent to 135 × 10^-1 g.

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