How many grams are in a mole of each of the following substances? (b) Br2

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Identify the substance: The problem asks for the molar mass of Br2, which is a diatomic molecule consisting of two bromine atoms.

Find the atomic mass of bromine (Br) from the periodic table. The atomic mass of Br is approximately 79.9 g/mol.

Calculate the molar mass of Br2 by multiplying the atomic mass of bromine by 2, since there are two bromine atoms in a molecule of Br2.

Set up the equation: Molar mass of Br2 = 2 * (atomic mass of Br).

Perform the multiplication to find the molar mass of Br2 in grams per mole.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Molar Mass

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all the atoms in a molecule. For diatomic molecules like bromine (Br2), the molar mass is twice the atomic mass of bromine, as there are two bromine atoms in each molecule.

Diatomic Molecules

Diatomic molecules consist of two atoms, which can be of the same or different elements. In the case of bromine (Br2), it is a diatomic molecule made up of two bromine atoms. Understanding that some elements naturally exist as diatomic molecules is crucial for accurately determining their molar mass.

Avogadro's Number

Avogadro's number, approximately 6.022 x 10^23, is the number of particles (atoms, molecules, etc.) in one mole of a substance. This concept is fundamental in chemistry as it allows for the conversion between the number of moles and the number of individual particles, facilitating calculations involving mass and quantity in chemical reactions.

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