(D) The target reaction for the formation of benzene is: $6C_{(s)} + 3H_{2(g)} \rightarrow C_6H_{6(l)} \; \Delta H_f = ?$Given combustion reactions:$1

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(D) The target reaction for the formation of benzene is: $6C_{(s)} + 3H_{2(g)} \rightarrow C_6H_{6(l)} \; \Delta H_f = ?$Given combustion reactions:$1$) $C_6H_{6(l)} + \frac{15}{2} O_2 \rightarrow 6CO_2 + 3H_2O \; \Delta H = Q_1$$2$) $C_{(s)} + O_2 \rightarrow CO_2 \; \Delta H = Q_2$$3$) $H_{2(g)} + \frac{1}{2} O_2 \rightarrow H_2O \; \Delta H = Q_3$To obtain the target reaction,we perform: $6 \times (2) + 3 \times (3) - (1)$:$\Delta H_f = 6Q_2 + 3Q_3 - Q_1$

Class 11 Chemistry Thermodynamics Heat of reaction, Bond energy and Hess law

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If the enthalpies of combustion of benzene $(l)$,carbon $(s)$,and hydrogen $(g)$ are $Q_1$,$Q_2$,and $Q_3$ respectively,what will be the enthalpy of formation of benzene?

A
$Q_1 + 6Q_2 + 3Q_3$
B
$6Q_2 + Q_1 + 3Q_3$
C
$6Q_2 - 3Q_3 - Q_1$
D
$6Q_2 + 3Q_3 - Q_1$

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Thermodynamics

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Heat of reaction, Bond energy and Hess law

The standard enthalpy of formation $(\Delta_fH^o)$ at $298 \ K$ for methane,$CH_{4(g)}$ is $-74.8 \ kJ \ mol^{-1}$. The additional information required to determine the average energy for $C-H$ bond formation would be

MediumAIEEE 2006

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Which of the following compounds will absorb the maximum quantity of heat when dissolved in the same amount of water? The heats of solution of these compounds at $25 \, ^\circ C$ in $kJ/mole$ of each solute are given in brackets.

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$C_{(s)} + O_{2(g)} \to CO_{2(g)}; \Delta H = -94 \ kcal$
$CO_{(g)} + \frac{1}{2}O_{2(g)} \to CO_{2(g)}; \Delta H = -67.7 \ kcal$
Then the heat of formation of $CO_{(g)}$ is $..... \ kcal$

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The heat change for the following reaction $C_{(s)} + 2S_{(s)} \to CS_{2(l)}$ is known as

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The heat of combustion of $C$,$S$ and $CS_2$ are $-393.3 \ kJ$,$-293.7 \ kJ$ and $-1108.76 \ kJ$ respectively. What will be the heat of formation of $CS_2$ in $kJ$?

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If the enthalpies of combustion of benzene $(l)$,carbon $(s)$,and hydrogen $(g)$ are $Q_1$,$Q_2$,and $Q_3$ respectively,what will be the enthalpy of formation of benzene?

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The standard enthalpy of formation $(\Delta_fH^o)$ at $298 \ K$ for methane,$CH_{4(g)}$ is $-74.8 \ kJ \ mol^{-1}$. The additional information required to determine the average energy for $C-H$ bond formation would be

Which of the following compounds will absorb the maximum quantity of heat when dissolved in the same amount of water? The heats of solution of these compounds at $25 \, ^\circ C$ in $kJ/mole$ of each solute are given in brackets.

$C_{(s)} + O_{2(g)} \to CO_{2(g)}; \Delta H = -94 \ kcal$$CO_{(g)} + \frac{1}{2}O_{2(g)} \to CO_{2(g)}; \Delta H = -67.7 \ kcal$Then the heat of formation of $CO_{(g)}$ is $..... \ kcal$

The heat change for the following reaction $C_{(s)} + 2S_{(s)} \to CS_{2(l)}$ is known as

The heat of combustion of $C$,$S$ and $CS_2$ are $-393.3 \ kJ$,$-293.7 \ kJ$ and $-1108.76 \ kJ$ respectively. What will be the heat of formation of $CS_2$ in $kJ$?

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$C_{(s)} + O_{2(g)} \to CO_{2(g)}; \Delta H = -94 \ kcal$
$CO_{(g)} + \frac{1}{2}O_{2(g)} \to CO_{2(g)}; \Delta H = -67.7 \ kcal$
Then the heat of formation of $CO_{(g)}$ is $..... \ kcal$