Which of the following equations represents a reaction that provides the heat of formation of CH3Cl?
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 BC(s)+3/2H2(g)+1/2Cl2(g)→CH3Cl(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”.