What will be the heat of formation of methane | vedclass

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(D) The given thermochemical equations are:$C(s) + O_2(g) 	o CO_2(g) \quad \Delta H_1 = -x \ kJ \dots (i)$$H_2(g) + \frac{1}{2} O_2(g) 	o H_2O(l) \q

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$(-x - 2y + z) \ kJ$

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(D) The given thermochemical equations are:$C(s) + O_2(g) 	o CO_2(g) \quad \Delta H_1 = -x \ kJ \dots (i)$$H_2(g) + \frac{1}{2} O_2(g) 	o H_2O(l) \quad \Delta H_2 = -y \ kJ \dots (ii)$$CH_4(g) + 2O_2(g) 	o CO_2(g) + 2H_2O(l) \quad \Delta H_3 = z \ kJ \dots (iii)$Note: Heat of combustion is energy released,so $\Delta H$ is negative. Given $z$ is the heat of combustion,$\Delta H_3 = -z \ kJ$.We need the heat of formation of methane:$C(s) + 2H_2(g) 	o CH_4(g) \quad \Delta H_f = ?$To obtain this,we perform: $(i) + 2 	imes (ii) - (iii)$$\Delta H_f = (-x) + 2(-y) - (-z) = -x - 2y + z \ kJ$.

What will be the heat of formation of methane,if the heat of combustion of carbon is $-x \ kJ$,heat of formation of water is $-y \ kJ$ and heat of combustion of methane is $z \ kJ$?

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