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Thermodynamics — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryThermodynamics1 Mark
MCQ
A thermochemical equation:
  • A
    Includes only the balanced chemical reaction
  • B
    Includes the balanced chemical reaction and change in enthalpy value
  • C
    Includes only the change in enthalpy value
  • D
    Includes the unbalanced chemical reaction and change in enthalpy value
✓

Answer

  1. Includes the balanced chemical reaction and change in enthalpy value

Explanation:

A thermochemical equation includes the balanced chemical reaction and change in enthalpy value.
A thermochemical equation  is a balanced chemical equation in which the exact value of enthalpy change, physical states and number of moles of reactants and products are specified. Following is the example of thermochemical equation between methane and oxygen.

CH4​(g)+2O2​(g) → CO2​(g) + 2H2​O(l)ΔHo = −890kJ

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