Molar Mass and Atomic Mass Concepts

The video tutorial explains how to calculate the molar mass of mercury(II) chloride (HgCl2). It begins by identifying the atomic masses of mercury and chlorine from the periodic table. The molar mass of mercury is 200.59 grams per mole, and chlorine is 35.45 grams per mole. Since there are two chlorine atoms in HgCl2, the chlorine mass is multiplied by two. These values are then added together to find the total molar mass of HgCl2, which is 271.49 grams per mole. The video also discusses rounding the result to two decimal points.

What is the atomic mass of mercury as found on the periodic table?

• 400.59 grams per mole

• 300.59 grams per mole

• 100.59 grams per mole

• 200.59 grams per mole

How many chlorine atoms are present in a molecule of HgCl2?

• Four

• Three

• Two

• One

What is the atomic mass of chlorine used in the calculation?

• 55.45 grams per mole

• 45.45 grams per mole

• 35.45 grams per mole

• 25.45 grams per mole

What is the molar mass of HgCl2 when rounded to two decimal points?

• 271.59 grams per mole

• 271.79 grams per mole

• 271.69 grams per mole

• 271.49 grams per mole

What might the molar mass of HgCl2 be if rounded to three decimal points?

• 271.506 grams per mole

• 271.596 grams per mole

• 271.406 grams per mole

• 271.496 grams per mole