The correct statement amongst the following is:

(A) The term 'standard state' implies that the temperature is 0°C

(B) The standard state of pure gas is the pure gas at a pressure of 1 bar and temper

Question

The correct statement amongst the following is:

(A) The term 'standard state' implies that the temperature is 0°C

(B) The standard state of pure gas is the pure gas at a pressure of 1 bar and temperature 273 K

(C)  is zero for O(g)

(D)  is zero for

Canvas Classes · Accepted Answer

Strategy:
 Standard enthalpy of formation () is defined as zero for an element in its standard reference state at any specified temperature.

Step 1: Evaluate D
The standard reference state for oxygen is the diatomic gas, . By definition, the enthalpy of formation of an element in its standard state is zero at any temperature . Thus,  for  is zero.

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