Question

A thermochemical equation

• A. Includes only the balanced chemical reaction
• B. Includes the balanced chemical reaction and change in enthalpy value
• C. Includes only the change in enthalpy value
• D. None of these options
• E. Includes the unbalanced chemical reaction and change in enthalpy value

Answer 1

The correct option is B Includes the balanced chemical reaction and change in enthalpy value

A thermochemical equation includes the balanced chemical reaction and change in enthalpy value.
A thermochemical equation is a balanced chemical equation in which the exact value of enthalpy change, physical states and number of moles of reactants and products are specified. Following is the example of thermochemical equation between methane and oxygen.
$C{H}_4\left(g\right)+2O_2\left(g\right)\to C{O}_2\left(g\right)+2H_{2}O\left(l\right)\Delta H^o=-890kJ$