The species which by definition has zero standard molar enthalpy of formation at $298 K$ is:

B r_{2} (g)

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C l_{2} (g)

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H_{2} O (g)

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C H_{4} (g)

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Solution

The correct option is B $C l_{2} (g)$
The standard molar enthalpy of formation of the element in its standard state is taken as zero. Since the standard state of $C l_{2}$ is gas, so it's $Δ_{f} H = 0$ .

Bromine and water exist in the liquid state at 298 K. Methane is not an elemental species.

Hence, the correct option is $B$ .

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Similar questions

The species which by definition has ZERO standard Molar enthalpy of formation at 298 k is

B r_{2} (g)

298 K

I

Δ H_{f}

{B r}_{2} (g)

1.00 a t m

298 K

0 k J / m o l

I I

Δ H_{f}

0

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