Cyclopentene is a cyclic hydrocarbon like the ones used in the experiment. In another bomb calorimetry experiment 0.8278 g of cyclopentene is burned and the temperature of the calorimeter increased from 19.341C to 22.955C. The heat capacity of the calorimeter is 10.56 kJ C−1. Calculate the enthalpy of formation of cyclopentene in kJ/mol cyclopentene. Compare this to the accepted value of +32.6 kJ mol−1.

Computed value is 45.3 kJ/mol whereas the accepted one is 32.6 kJ/mol which means there is a significant difference between them.

Explanation:

Hello.

In this case, for this problem we write the following equation, representing that the heat released due to the combustion of cyclopentane equals the heat gained by the calorimeter:

Which can be also written as:

In such a way, we can compute the enthalpy of combustion of cyclopentane:

Next, since the combustion of cyclopentane is:

And the enthalpy of combustion is computed thermochemically as:

Since the enthalpy of formation of CO2 and H2O are -395.5 and -241.8 kJ/mol respectively, we can compute the enthalpy of formation of cyclopentane based on the previously computed enthalpy of combustion on the calorimeter part:

In such a way, we see a significant difference between the computed value 45.3 kJ/mol and the accepted value 32.6 kJ/mol.

Best regards.

the leaf is an organ of a typical plant, and the main functions are to complete photosynthesis and allow the plant to exchange gas, just like how we have the respiratory system. leaves have the stomata, which collects maintains co2 and o2 levels. this is necessary for cell metabolism. the leaf also collects sunlight using chloroplasts. succinctly, leaves own a pivotal role in sustaining plant life.

mark him as !