Enthalpy Calculations

Enthalpy Calculations

Enthalpy:

1. In one experiment the burning of 0.980g of ethanol, resulted in the temperature of 400cm³ of water rising from 14.2^oC to 31.6^oC.

Use the information to calculate the energy released during the reaction.

2.

A student dissolved 10.0g of ammonium chloride in 200cm³ of water and found that the temperature of the solution fell from 23.2^oC to 19.8^oC.

Calculate the enthalpy change for the reaction.

3.

0.19 g of methanol, CH₃OH, is burned and the heat energy given out increased the temperature of 100g of water from 22^oC to 32^oC.

Calculate the enthalpy change.

4.

8g of ammonium nitrate, NH₄NO₃, is dissolved in 200cm³ of water. The temperature of the water falls from 20^oC to 17.1^oC.

Calculate the enthalpy change for this reaction.

5.

When 74.5g of KCl is dissolved in water the enthalpy change is + 16.75kJ mol^-1.

What will be the temperature change when 14.9g of potassium chloride is dissolved in 150cm³ of water?