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The standard enthalpy of formation (∆f298) for methane, CH4 is – 74.9 kJ mol–1. In order to calculate the average energy given out in the formation of a C – H bond from this it is necessary to know which one of the following?
  • a)
    The dissociation energy of the hydrogen molecule, H2.
  • b)
    The first four ionisation energies of carbon.
  • c)
    The dissociation energy of H2 and enthalpy of sublimation of carbon (graphite).
  • d)
    The first four ionisation energies of carbon and electron affinity of hydrogen.
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The standard enthalpy of formation (∆fH°298) for methane, CH4 is – 74...
To calculate average enthalpy of C - FI bond in methane following informations are needed
(i) dissociation energy of H2, i.e.
∆H = x(Suppose)
(ii) Sublimation energy of C(graphite) to C(g)
∆H = y (Suppose)
C (graphite) + 2H 2(g) → CH4 (g); ∆H = 75 kj mol-1
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The standard enthalpy of formation (∆fH°298) for methane, CH4 is – 74.9 kJ mol–1. In order to calculate the average energy given out in the formation of a C – H bond from this it is necessary to know which one of the following?a)The dissociation energy of the hydrogen molecule, H2.b)The first four ionisation energies of carbon.c)The dissociation energy of H2 and enthalpy of sublimation of carbon (graphite).d)The first four ionisation energies of carbon and electron affinity of hydrogen.Correct answer is option 'C'. Can you explain this answer?
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The standard enthalpy of formation (∆fH°298) for methane, CH4 is – 74.9 kJ mol–1. In order to calculate the average energy given out in the formation of a C – H bond from this it is necessary to know which one of the following?a)The dissociation energy of the hydrogen molecule, H2.b)The first four ionisation energies of carbon.c)The dissociation energy of H2 and enthalpy of sublimation of carbon (graphite).d)The first four ionisation energies of carbon and electron affinity of hydrogen.Correct answer is option 'C'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about The standard enthalpy of formation (∆fH°298) for methane, CH4 is – 74.9 kJ mol–1. In order to calculate the average energy given out in the formation of a C – H bond from this it is necessary to know which one of the following?a)The dissociation energy of the hydrogen molecule, H2.b)The first four ionisation energies of carbon.c)The dissociation energy of H2 and enthalpy of sublimation of carbon (graphite).d)The first four ionisation energies of carbon and electron affinity of hydrogen.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The standard enthalpy of formation (∆fH°298) for methane, CH4 is – 74.9 kJ mol–1. In order to calculate the average energy given out in the formation of a C – H bond from this it is necessary to know which one of the following?a)The dissociation energy of the hydrogen molecule, H2.b)The first four ionisation energies of carbon.c)The dissociation energy of H2 and enthalpy of sublimation of carbon (graphite).d)The first four ionisation energies of carbon and electron affinity of hydrogen.Correct answer is option 'C'. Can you explain this answer?.
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