under the same condition heats of formation of water and CO2 are -285 and -394 kJ/mol respectively. The heat of combustion of methane is -890kj/mol. The heat of formation of methane in kj/mol is?
(1) -964
(2)-890
(3)-222
(4)-74
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2
Answer:
(iii) used to determine pressure volume work. (iv) whose value depends on temperature only. In thermodynamics, a state function, function of state, state quantity, or state variable is a property of a system that depends only on the current state of the system, not on the way in which the system acquired that state.....
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1
Answer:
Explanation:
The required equation for the combustion of methane is:
CH
4
+2O
2
⟶CO
2
+2H
2
O;ΔH=?
ΔH
=ΔH
f(products)
−ΔH
f(reactants)
=[ΔH
(CO
2
)
+2×ΔH
(H
2
O)
]−[ΔH
(CH
4
)
+2×ΔH
(O
2
)
]
=[(−398.8)−2×241.6]−[(−76.2)−2×0]=−805.8 kJmol
−1
Heat evolved by burning 22.4 litre (1 mole) methane=−805.8 kJ.
So, heat evolved by burning 1000 litre (1 m
3
) methane=
22.4
805.8
×1000=−35973.2 kJ
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