Question

A sample of solid isophthalic acid ($C_8H_6O_4$) that weighs 1.009 g is burned in an excess of oxygen to $CO_2(g)$ and $H_2O(l)$ in a constant-volume calorimeter at 25.000°C. The temperature rise is observed to be 2.030°C. The heat capacity of the calorimeter and its contents is known to be 9593 J K⁻¹. (a) Write and balance the chemical equation for the combustion reaction. (Use the lowest possible coefficients. Be sure to specify states such as (aq) or (s). If a box is not needed, leave it blank.) Based on this experiment: (b) Calculate the standard change in internal energy ($\Delta U$) for the combustion of 1.000 mol of Isophthalic acid to $CO_2(g)$ and $H_2O(l)$. kJ mol⁻¹ (c) Calculate the standard enthalpy change ($\Delta H$) for the same reaction as in part (b). kJ mol⁻¹ (d) Calculate the standard enthalpy of formation per mole of isophthalic acid, using the following for the standard enthalpies of formation of $CO_2(g)$ and $H_2O(l)$: $\Delta H_f°(H_2O(l)) = -285.83$ kJ mol⁻¹ and $\Delta H_f°(CO_2(g)) = -393.51$ kJ mol⁻¹

          A sample of solid isophthalic acid ($C_8H_6O_4$) that weighs 1.009 g is burned in an excess of oxygen to $CO_2(g)$ and $H_2O(l)$ in a constant-volume calorimeter at 25.000°C. The temperature rise is observed to be 2.030°C. The heat capacity of the calorimeter and its contents is known to be 9593 J K⁻¹.
(a) Write and balance the chemical equation for the combustion reaction. (Use the lowest possible coefficients. Be sure to specify states such as (aq) or (s). If a box is not needed, leave it blank.)
Based on this experiment:
(b) Calculate the standard change in internal energy ($\Delta U$) for the combustion of 1.000 mol of Isophthalic acid to $CO_2(g)$ and $H_2O(l)$.
kJ mol⁻¹
(c) Calculate the standard enthalpy change ($\Delta H$) for the same reaction as in part (b).
kJ mol⁻¹
(d) Calculate the standard enthalpy of formation per mole of isophthalic acid, using the following for the standard enthalpies of formation of $CO_2(g)$ and $H_2O(l)$: $\Delta H_f°(H_2O(l)) = -285.83$ kJ mol⁻¹ and $\Delta H_f°(CO_2(g)) = -393.51$ kJ mol⁻¹

a sample of solid isophthalic acid c8h6o4 that weighs 1009 g is burned in an excess of oxygen to co2g and h2ol in a constant volume calorimeter at 25000c the temperature rise is observe 34724

Added by Hannah S.

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