In an experiment to measure the enthalpy change of a reaction involving gases,which of the following conditions must always be kept constant?A) Pressure B )Temperature C )Volume D )Temperature and...

In an experiment to measure the enthalpy change of a reaction involving gases,
which of the following conditions must always be kept constant?
A) Pressure

B )Temperature

C )Volume

D )Temperature and pressure

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Top Answer

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llltkl | College Teacher | (Level 3) Valedictorian

Posted on

Enthalpy or heat content of a gaseous system is defined as the sum of the internal energy and the product of its pressure volume.

H = E + PV

Where, E is the internal energy, P is the constant pressure, and V is the volume of the system.

Change in enthalpy ∆H, is defined as the amount of energy exchanged with the surroundings at constant pressure and temperature.

It is expressed as: ∆H = ∆E + P∆V

An apparently similar term, change in energy at constant volume is known as internal energy change ∆E.

Hence the right option here, is thus D).

Sources:

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