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MHT CET202411 May 2024Evening ShiftChemistryThermodynamics (C)Actual

Calculate the enthalpy change when 12 g carbon react with sufficient hydrogen to form methane. If enthalpy of formation of methane is -75 ~kJ ~mol ⁻¹ .

Options

  1. A-45 ~kJ
  2. B-60 kJ
  3. C-75 kJ
  4. D-90 kJ

Correct answer

C. -75 kJ

Step-by-step solution

The reaction under consideration is the formation of methane ( CH ₄ ) from carbon ( C ) and hydrogen ( H ₂ ) , which can be represented as: C ( ~s )+2 H ₂( ~g ) CH ₄( ~g ) The given standard enthalpy of formation for methane ( CH ₄ ) is: H_f^ =-75 ~kJ ~mol ⁻¹ This value indicates the enthalpy change for the formation of one mole of methane under standard conditions. To calculate the enthalpy change for the reaction involving 12 g of carbon, follow these steps: Calculate the number of moles of carbon (C): The molar

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