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BITSAT2009ChemistryThermodynamics (C)Actual

Which one of the following is correct regarding H :

Options

  1. AH = E +2 RT
  2. BH = E -2 RT
  3. CH = E + RT
  4. DH = E - RT

Correct answer

B. H = E -2 RT

Step-by-step solution

N ₂+3 H ₂ 2 NH ₃ According to thermodynamics's Ist law H = E + nRT Where H = enthalpy of reaction at constant pressure E = heat of reaction at constant volume R = molar gas constant array l T = temperature of the reaction n =( no. of moles of product )-( no. of moles array of reactant.) From reaction, n = n _ p - n _ R =2-4=-2 Hence, H = E -2 RT .

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