The heat of combustion of C_xH_y,carbon,and h | vedclass

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(B) The target equation for the heat of formation of $C_xH_y$ is:$x C + \frac{y}{2} H_2 	o C_xH_y \quad \Delta H_f = ?$Given combustion reactions:$(i

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$\left( xb + \frac{yc}{2} - a \right) \ cal$

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(B) The target equation for the heat of formation of $C_xH_y$ is:$x C + \frac{y}{2} H_2 	o C_xH_y \quad \Delta H_f = ?$Given combustion reactions:$(i) \ C + O_2 	o CO_2 \quad \Delta H = b$$(ii) \ H_2 + \frac{1}{2} O_2 	o H_2O \quad \Delta H = c$$(iii) \ C_xH_y + (x + \frac{y}{4}) O_2 	o x CO_2 + \frac{y}{2} H_2O \quad \Delta H = a$To obtain the target equation,perform: $x 	imes (i) + \frac{y}{2} 	imes (ii) - (iii)$:$\Delta H_f = x(b) + \frac{y}{2}(c) - a$$\Delta H_f = \left( xb + \frac{yc}{2} - a ight) \ cal$

The heat of combustion of $C_xH_y$,carbon,and hydrogen are $a, b$,and $c \ cal/mole$ respectively. The heat of formation of $C_xH_y$ will be:

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