The correct statement amongst the following is: Thermodynamics [2025]

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Q.
The correct statement amongst the following is: [2025]

1 The term 'standard state' implies that the temperature is $0 ° C$ .

2 The standard state of pure gas is the gas at a pressure of 1 bar and temperature 273 K.

3 $Δ_{f} H_{298}^{⊖}$ is zero for O(g)

4 $Δ_{f} H_{500}^{⊖}$ is zero for $O_{2}$ (g)

Ans.
(4)

Temperature is not included for definition of standard state. Heat of formation of most stable state of an element (called as standard state) is taken as zero.
Standard state for oxygen is $O_{2}$ . So $Δ H_{f} ° (O_{2}) = 0$ at all temperatures.

Solution

Q.
The correct statement amongst the following is: [2025]

1 The term 'standard state' implies that the temperature is $0 ° C$ .

2 The standard state of pure gas is the gas at a pressure of 1 bar and temperature 273 K.

3 $Δ_{f} H_{298}^{⊖}$ is zero for O(g)

4 $Δ_{f} H_{500}^{⊖}$ is zero for $O_{2}$ (g)

Ans.
(4)

Temperature is not included for definition of standard state. Heat of formation of most stable state of an element (called as standard state) is taken as zero.
Standard state for oxygen is $O_{2}$ . So $Δ H_{f} ° (O_{2}) = 0$ at all temperatures.

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Solution

Q. The correct statement amongst the following is: [2025]

1 The term 'standard state' implies that the temperature is 0°C.

2 The standard state of pure gas is the gas at a pressure of 1 bar and temperature 273 K.

3 ΔfH298⊖ is zero for O(g)

4 ΔfH500⊖ is zero for O2(g)

Ans. (4) Temperature is not included for definition of standard state. Heat of formation of most stable state of an element (called as standard state) is taken as zero. Standard state for oxygen is O2. So ΔHf°(O2)=0 at all temperatures.

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Q.
The correct statement amongst the following is: [2025]

1 The term 'standard state' implies that the temperature is $0 ° C$ .

3 $Δ_{f} H_{298}^{⊖}$ is zero for O(g)

4 $Δ_{f} H_{500}^{⊖}$ is zero for $O_{2}$ (g)

Ans.
(4)

Temperature is not included for definition of standard state. Heat of formation of most stable state of an element (called as standard state) is taken as zero.
Standard state for oxygen is $O_{2}$ . So $Δ H_{f} ° (O_{2}) = 0$ at all temperatures.