71.

What is the significance of enthalpy of fusion?

What is the significance of enthalpy of combustion?

Under what conditions, the heat absorbed by the system is equal to the work done by the system?

State Hess's law of constant heat summation.

What is calorific value?

The heat of combustion of glucose (C₆H₁₂,O₆) is 2840 kJ mol^–1. What is its calorific value?

Define bond enthalpy.

Is the bond enthalpy of all the four C – H bonds in CH₄ molecule equal ? If not, then why ? How is the C – H bond energy then reported ?

What are renewable sources of energy?

When does bond enthalpy become equal to bond dissociation enthalpy?