Molar Mass and Bromine Calculations

In this video, Dr. B explains how to calculate the molar mass of bromine gas (Br2). He starts by identifying the atomic mass of bromine from the periodic table, which is 79.90 grams per mole. Since Br2 consists of two bromine atoms, he multiplies the atomic mass by two to get the molar mass of 159.80 grams per mole. Dr. B notes that different periodic tables may round atomic masses differently, which could lead to slight variations in the calculated molar mass. The video concludes with a thank you message from Dr. B.

What is the atomic mass of a single bromine atom as mentioned in the video?

• 159.80 grams per mole

• 12.01 grams per mole

• 79.90 grams per mole

• 35.45 grams per mole

How do you calculate the molar mass of Br2?

• Multiply the atomic mass of one bromine atom by two

• Subtract the atomic mass of one bromine atom from another

• Add the atomic masses of two bromine atoms

• Divide the atomic mass of one bromine atom by two

What is the calculated molar mass of Br2 as per the video?

• 12.01 grams per mole

• 35.45 grams per mole

• 159.80 grams per mole

• 79.90 grams per mole

Why might your calculated molar mass of Br2 differ slightly from the one in the video?

• Because of a different chemical formula

• Due to a different number of bromine atoms

• Because of a different calculation method

• Due to rounding differences in the periodic table

Who is the presenter of the video?

• Dr. C

• Dr. B

• Dr. D

• Dr. A