132. On complete combustion of 2 gm methane
26575 Cal heat is generated. The heat of formation
of methane will be (given heat of formation of CO,
and H,O are -97000 and -68000 Cal
respectively):
(1) + 20400 Cal (2) + 20600 Cal
(3) - 20400 Cal
(4) - 2000 Cal
Answers
The heat of formation of methane will be 20400 Cal.
Explanation:
=> Formula for this reaction:
CH₄ + 2O₂ ---> CO₂ + 2H₂O
For 2gm CH4 = -26575 cals
For 16gm = -(26575/2)*16= -212600
=> According to the question,The heat of formation of CO₂ and H₂O are -97000 and -68000 Cal respectively.
∴ ΔHcomb = ΔHf (CO₂) +2ΔHf( H₂O ) - ΔHcomb (CH₄)
=-97000+2(-68000)-(-212600)
=-97000-136000+212600
=-20400 Cal
Thus, The heat of formation of methane will be 20400 Cal.
Learn more:
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