Question

An extensive property is defined as the property that depends on the amount of matter involved.

Enthalpy is an extensive property.

The standard enthalpy of the reaction is as follows:

Fe(s) + 5C(s,graphite) + 5/2O2(g) Fe(CO)5(l) Ho = -774 kJ

If the amount of the matter is doubled, the enthalpy change value will be 2 times the initial enthalpy.

2Fe(s) + 10C(s,graphite) + 5O2(g) 2Fe(CO)5(l) Ho = -774 kJ x 2

Thus,

Ho = -774 kJ x 2

Ho = -1548 kJ Or -1550 kJ [3S.F]

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