What is the molar mass of HBr?
What is the molar mass of HBr?
The Correct Answer and Explanation is:
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Correct Answer:
The molar mass of HBr (hydrogen bromide) is 80.91 g/mol.
Explanation
The molar mass of a compound is the mass of one mole of that substance, typically expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all atoms in the molecule, based on the periodic table.
For hydrogen bromide (HBr), the molecule consists of:
- 1 hydrogen (H) atom
- 1 bromine (Br) atom
Let’s determine their atomic masses:
- Hydrogen (H): 1.008 g/mol
- Bromine (Br): 79.904 g/mol
To calculate the molar mass of HBr:Molar mass of HBr=Atomic mass of H+Atomic mass of Br\text{Molar mass of HBr} = \text{Atomic mass of H} + \text{Atomic mass of Br}Molar mass of HBr=Atomic mass of H+Atomic mass of Br=1.008 g/mol+79.904 g/mol=80.912 g/mol= 1.008\ \text{g/mol} + 79.904\ \text{g/mol} = 80.912\ \text{g/mol}=1.008 g/mol+79.904 g/mol=80.912 g/mol
Rounded to two decimal places, the molar mass of HBr is 80.91 g/mol.
This value is essential in chemistry for various calculations. For example, when working with gases, knowing the molar mass allows chemists to convert between grams and moles using the formula:Moles=Mass (g)Molar mass (g/mol)\text{Moles} = \frac{\text{Mass (g)}}{\text{Molar mass (g/mol)}}Moles=Molar mass (g/mol)Mass (g)
Hydrogen bromide is a diatomic molecule and an important hydrogen halide, used in both industrial and laboratory settings. It exists as a gas at room temperature and forms hydrobromic acid (HBr(aq)) when dissolved in water.
Understanding the molar mass is also important in stoichiometry, where balanced chemical equations require mole ratios. For example, in reactions involving HBr, you would use its molar mass to determine how much reactant or product is needed or formed.
In summary, the molar mass of HBr is 80.91 g/mol, calculated by summing the atomic masses of hydrogen and bromine. This value is fundamental for performing precise chemical calculations involving hydrogen bromide.
