Why do I not use the amount of C5H10 (2.4g) that was from the reaction that comb

Question

Why do I not use the amount of C5H10 (2.4g) that was from the reaction that combusted in the constant-volume calorimeter?
210 AV to +50.2 J Io I. 3. Question a: 4 Combustion l'Yn Releau ing heat odmWir of the 2.4 g Sample of A H 0. measured to eter increases is combusted in a constant-volume calorimeter, the temperature be 8.21 from 22.3°C to 4 The heat capacity of the calorimeter was kl/oc. Calculate absorbed Cou -com B. 162 kJ Released by C. 530. D. -530. 16 1.7 77 CT HRY Question 5 mny DO I not VSE amT ob C5Hlo that Comb Select the two true statements about enthalpy (H) and internal energy (E. A. Enthalpy is a state function. and the performed by a B. Internal energy change is the sum of the heat released work chemical reaction. pressure. c. Internal energy is the heat evolved by a chemical reaction at constant by a chemical holm changn is the sum of the heat released and the work performed

Explanation / Answer

You have calcualted the enthalpy of the reaction Not molar enthalpy of the reaction. Enthalpy of the reaction is measurment of heat released from the reaction without measuring moles of starting material. We no need to use the amount of C5H10 that you took. Hence you have not included the amount of C5H10.

In case if question was asked to calculate molar enthalpy, then you have to calculate the moles that you used for the reaction.

Just to calculate the enthalpy of reaction, we no need to have starting material weights

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