Chemistry Class 11 NCERT Solutions: Chapter 6 Thermodynamics Part 3

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Q: 11 Enthalpy of combustion of carbon to is Calculate the heat released upon formation of of from carbon and dioxygen gas.

Answer:

Formation of from carbon and dioxygen gas can be represented as:

Heat released on formation of

Q: 12. Enthalpies of formation of

respectively. Find the value of for the reaction:

Answer:

for a reaction is defined as the difference between value of products and value of reactants.

For the given reaction,

Substituting the values of question, we get:

Hence, the value of for the reaction is

Q: 13 Given

What is the standard enthalpy of formation of gas?

Answer:

Standard enthalpy of formation of a compound is the change in enthalpy that takes place during the formation of 1 mole of a substance in its standard form its constituent elements in their standard state.

Re-Writing the given equation for 1 mole of

Q: 14. Calculate the standard enthalpy of formation of from following data:

Answer:

The reaction that takes place during the formation of can be written as:

The reaction (1) can be obtained from the given reactions by following the algebraic calculations as:

Equation (ii) equation (iii) – equation (i)