Which of the following state of bromine will have standard heat formation to be equal to zero? Liquid bromine, solid bromine, gaseous bromine molecules.

Explanation

To determine which state of bromine has a standard heat of formation equal to zero, we need to understand the concept of standard heat of formation and the states of matter.

### Step-by-Step Solution:

1. **Understanding Standard Heat of Formation**:
The standard heat of formation (ΔH°f) of a substance is defined as the heat change that results when one mole of a compound is formed from its elements in their standard states at 25°C (298 K) and 1 atm pressure. For elements in their standard state, the standard heat of formation is defined to be zero.

2. **Identifying the Standard States of Bromine**:
...