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AP EAMCET202119 Aug 2021Evening ShiftChemistryThermodynamics (C)Actual

When the temperature of 2 moles of an ideal gas is increased by 20 ° C at constant pressure, find the work involved in the process.

Options

  1. A5 R
  2. B40 R
  3. C15 R
  4. D20 R

Correct answer

B. 40 R

Step-by-step solution

We know that for ideal gas PV = nRT Now taking small changes ∆ ( PV ) = nR ∆ T as pressure remains constant. So P ∆ V = nR ∆ T Work done in increasing the kinetic energy of gas is given by W = P ∆ V From the above expression, work can be modified as W = nRΔT W = 2 × R × 20 W = 40   R

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