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For the reaction A + B <=> 2C the equilibrium constant is 100 at 298 K. If each of the three species starts at an initial concentration of 1 M, the equilibrium concentration of C equals x * 10⁻¹ M. Find the nearest integer value of x.

1. 25
2. 20
3. 15
4. 30

Correct answer: 25

Solution

Solving the equilibrium expression gives extent p = 0.75, so [C] = 1 + 2(0.75) = 2.5 M = 25 * 10⁻¹ M, hence x = 25.

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