Molar Mass Calculations and Concepts

The video tutorial explains how to calculate the molar mass of sodium sulfate (Na2SO4). It begins by identifying the atomic masses of sodium, sulfur, and oxygen from the periodic table. The tutorial then demonstrates how to calculate the total mass by adding the masses of two sodium atoms, one sulfur atom, and four oxygen atoms. The final molar mass is calculated as 142.04 grams per mole. The video concludes with a note on rounding differences based on periodic table versions.

What is the first step in finding the molar mass of a compound like sodium sulfate?

• Determine the chemical formula of the compound.

• Calculate the total mass of the compound.

• Look up the atomic masses on the periodic table.

• Identify the number of atoms in the compound.

How many sodium atoms are present in sodium sulfate (Na2SO4)?

• Four

• One

• Two

• Three

What is the atomic mass of sulfur used in the calculation of sodium sulfate's molar mass?

• 16.00 grams per mole

• 22.99 grams per mole

• 32.07 grams per mole

• 35.45 grams per mole

How many oxygen atoms are in the chemical formula of sodium sulfate?

• Four

• Two

• Three

• Five

What is the total molar mass of sodium sulfate (Na2SO4) as calculated in the video?

• 120.04 grams per mole

• 180.04 grams per mole

• 142.04 grams per mole

• 160.04 grams per mole

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

• The chemical formula might be incorrect.

• Different periodic tables may round atomic masses differently.

• The units of measurement might be different.

• The number of atoms in the compound might change.