1. Tardigrade
  2. Question
  3. Chemistry
  4. Consider the following conventions related to thermochemical equations. I. The coefficients of different substances in a balanced thermochemical equation show only number of moles involved in the reaction. II. Enthalpy is an extensive property thus if a thermochemical equation is multiplied or divided by an integer n, the value of Δr H° is also multiplied or divided by the integer, n. III. On reversed a reaction, the sign of Δ H is also reversed but its magnitude also changes. Select the correct statement and choose the correct option.

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Q. Consider the following conventions related to thermochemical equations.
I. The coefficients of different substances in a balanced thermochemical equation show only number of moles involved in the reaction.
II. Enthalpy is an extensive property thus if a thermochemical equation is multiplied or divided by an integer $n$, the value of $\Delta_{r} H^{\circ}$ is also multiplied or divided by the integer, $n$.
III. On reversed a reaction, the sign of $\Delta H$ is also reversed but its magnitude also changes.
Select the correct statement and choose the correct option.

Thermodynamics

Solution:

Statement I and II are correct, while the statement III is incorrect.
It's correct form is as follows :
"On reversing a reaction, the sign of $\Delta H$ is also reversed but its magnitude remains the same.