Standard heat of formation at `298K` is arbitrarily taken to be zero for

Options

A. Liquid bromine
B. Gaseous bromine atoms
C. Gaseous bromine molecules
D. Solid bromine

Explanation

To solve the question regarding the standard heat of formation at 298 K being arbitrarily taken to be zero, we can follow these steps:

### Step 1: Understand the Concept of Standard Heat of Formation
The standard heat of formation (ΔH_f°) of a substance is defined as the change in enthalpy when one mole of the substance is formed from its elements in their standard states.

### Step 2: Identify the Standard State of Bromine
Bromine can exist in different states: solid (bromine crystals), liquid (liquid bromine), and gas (bromine vapor). At standard conditions (1 atm pressure and 298 K), bromine is found in the liquid state.

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