$\Delta_f \mathrm{H}_{500}^\theta$ is zero for $\mathrm{O}_2(\mathrm{~g})$
B
The term 'standard state' implies that the temperature is $0^{\circ} \mathrm{C}$.
C
$\Delta_f \mathrm{H}_{298}^\theta$ is zero for $\mathrm{O}(\mathrm{g})$
D
The standard state of a pure gas is the pure gas at a pressure of 1 bar and temperature 273 K .
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
Sol. For standard state ⇒ pressure = 1 bar and temperature is specified only
$$
\Rightarrow\left(\Delta \mathrm{H}_{\mathrm{f}}^{\circ}\right)_{\mathrm{O}_{2,(\mathrm{~g})}}=0
$$
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