Chemistry Class-11: Chapter –6. Thermodynamics Part – 6

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Question: 39

Heat capacity is an extensive property but specific heat is an intensive property. What will be the relation between and c for of water?

Answer:

For water, heat capacity specific heat

Or

Specific

Heat capacity

Question: 40

The difference between and can be derived using the empirical relation H = U + pV. Calculate the difference between and for of an ideal gas.

Answer:

Question: 41

If the combustion of of graphite produces of heat, what will be molar enthalpy change? Give the significance of sign also.

Answer:

Question: 42

The net enthalpy change of a reaction is the amount of energy required to break all the bonds in reactant molecules minus amount of energy required to form all the bonds in the product molecules. What will be the enthalpy change for the following reaction?

Given that Bond energy of and respectively.

Answer:

Bond energy of Bond energy of Bond energy of

Question: 43

The enthalpy of vapourisation of . Calculate the heat required for the vapourisation of of at constant pressure. .

Answer:

∴ Heat required for vapourisation of

Question: 44

The enthalpy of reaction for the reaction :

.

What will be standard enthalpy of formation of

?

Answer:

According to the definition of standard enthalpy of formation, the enthalpy change for the following reaction will be standard enthalpy of formation of

Or the standard enthalpy of formation of will be half of the enthalpy of the given equation i.e., is also halved.

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