Question

Is the standard enthalpy of combustion of glucose likely to be higher or lower at blood temperature than at 25°C?

Answer 1

The standard enthalpy of combustion of glucose likely to be higher at blood temperature than at 25°C

Normal blood temperature is 37°C. Kirchhoff's Law that enthalpy of any substance increases with temperature. If the heat capacity is temperature independent over the temperature range, then

H_Tf = H_Ti + cp (T_f−T_i)

Where cp is the (assumed constant) heat capacity and

H_Ti and H_Tf are the enthalpy at the respective temperatures.

The standard enthalpy of combustion of glucose at 25°C is 2800 kJ/mol while at blood temperature the standard enthalpy of combustion of glucose is 2870KJ/mol