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Most Important Selected Qs for JEE AdvancedChemistryThermodynamics (C)

Paragraph: Concrete is produced from a mixture of cement, water, sand and small stones. It consists primarily of calcium silicates and calcium aluminates formed by heating and grinding of clay and limestone. In later steps of cement production a small amount of gypsum, CaSO ₄ 2 H ₂ O is added to improve subsequent hardening of concrete. The use of elevated temperatures during the final production may lead to formatio

Options

  1. A17.35 10⁻⁴ bar
  2. B2.15 10⁻⁴ bar
  3. C8.10 10⁻³ bar
  4. D7.00 10⁻⁴ bar

Correct answer

C. 8.10 10⁻³ bar

Step-by-step solution

aligned & H ^ = H ^ - S ^ & =17920 ~J ~mol ⁻¹ & G ^ =-2.303 R TogK _ p & _ p = G ^ 2.303 R RT =7.22 10⁻⁴ ( p _ H ₂ O )^ 3 2 & p _ H ₂ O =8.1 10⁻³ ~atm aligned

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