Molar Mass and Chemical Composition

This video tutorial explains how to calculate the molar mass of iron(II) chloride (FeCl2). It begins with identifying the atomic masses of iron and chlorine from the periodic table, then demonstrates the calculation by adding the mass of one iron atom and two chlorine atoms. The final molar mass is determined to be 126.75 grams per mole. The video concludes with a note on potential variations in results due to differences in periodic table decimal places.

What is the atomic mass of iron as mentioned in the video?

• 75.55 grams per mole

• 55.85 grams per mole

• 126.75 grams per mole

• 35.45 grams per mole

How many chlorine atoms are present in one molecule of FeCl2?

• One

• Two

• Three

• Four

What is the molar mass of FeCl2 as calculated in the video?

• 55.85 grams per mole

• 126.75 grams per mole

• 161.20 grams per mole

• 70.90 grams per mole

Why might the calculated molar mass differ slightly when using different periodic tables?

• Different tables have different atomic masses.

• Different tables have different atomic numbers.

• Different tables have different element names.

• Different tables have different element symbols.

What is the significance of the molar mass in terms of one mole of FeCl2?

• It represents the number of atoms in FeCl2.

• It represents the density of FeCl2.

• It represents the volume of FeCl2.

• It represents the mass of one mole of FeCl2.