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Question

Which of the following equations represents a reaction that provides the heat of formation of $$CH_{3}Cl$$?


A
C(s)+HCl(g)+H2(g)CH3Cl(g)
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B
C(s)+3/2H2(g)+1/2Cl2(g)CH3Cl(g)
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C
C(s)+3H(g)+Cl(g)CH3Cl(g)
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D
CH4(g)+Cl2(g)CH3Cl(g)+HCl(g)
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Solution

The correct option is B $$C(s)+3/2\:H_2(g)+1/2\:Cl_2(g)\rightarrow CH_3Cl(g)$$
The heat of Formation or enthalpy of Formation: The amount of heat absorbed or evolved when 1 mole of the substance is directly obtained from its constituent elements in their standard state is called “Heat of formation”.

so the heat of formation of $$CH_3Cl$$ 

$$C(s)+3/2\:H_2(g) + 1/2 Cl_2(g)\rightarrow CH_3Clg)$$

Hence, the correct option is $$\text{B}$$

Chemistry

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