The species which by definition has ZERO standard molar enthalpy of formation at 298 K is

Question

The species which by definition has ZERO standard molar enthalpy of formation at 298 K is (A) Br 2 ( g ) (B) Cl 2 ( g ) (C) H 2 O ( g ) (D) CH 4 ( g )

Tardigrade Admin · Accepted Answer

Cl 2 is gas at 298 K while Br 2 is a liquid.

Q. The species which by definition has ZERO standard molar enthalpy of formation at $298 K$ is

$B r_{2} (g)$

$C l_{2} (g)$

$H_{2} O (g)$

$C H_{4} (g)$

$C l_{2}$ is gas at $298 K$ while $B r_{2}$ is a liquid.

Q. The species which by definition has ZERO standard molar enthalpy of formation at 298K is

Br2​(g)

Cl2​(g)

H2​O(g)

CH4​(g)

Cl2​ is gas at 298K while Br2​ is a liquid.

Q. The species which by definition has ZERO standard molar enthalpy of formation at $298 K$ is

$B r_{2} (g)$

$C l_{2} (g)$

$H_{2} O (g)$

$C H_{4} (g)$

$C l_{2}$ is gas at $298 K$ while $B r_{2}$ is a liquid.