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Question

Given C(s)+O2(g)CO2(g)+94.2Kcal
H2(g)+12O2(g)H2O(l)+68.3Kcal
CH4(g)+2O2(g)CO2(g)+2H2O(l)+210.8Kcal
The heat of formation of methane in kcal will be:

A
-45.9
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B
-47.8
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C
-20
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D
-47.3
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Solution

The correct option is C -20
C+O2CO2+94.2 K cal.
H2+12O2H2O+68.3 K cal.
CH4+2O2CO2+2H2O+210.8 K cal.
C+O2Co2+94.2 K cal.
2H2+O22H2O+68.3×2
CO2+2H2OCH4+2O2210.8 K cal
C+2H2CH4
H=(94.2+136.6+(210.8)k cal)
H=20 K cal
Enthalpy of formation of methane =20 K cal

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