Molar Mass and Molecular Formulas

The video tutorial revisits Avogadro's number and the concept of the mole, emphasizing that one mole equals 6.022 x 10^23 of something. It introduces molar mass, explaining it as the mass in grams of one mole of an element, numerically equal to the atomic weight in atomic mass units. Examples with chlorine and gold illustrate this concept. The tutorial then extends the idea to molecules, using glucose as an example to demonstrate calculating molar mass by summing the atomic weights of its constituent atoms. The tutorial concludes by confirming that the molar mass of glucose is 180.0 grams per mole.

What is the value of Avogadro's number?

• 6.022 x 10^25

• 6.022 x 10^24

• 6.022 x 10^23

• 6.022 x 10^22

What does the molar mass of an element represent?

• The mass of one atom in grams

• The number of atoms in a mole

• The volume of one mole of the element

• The mass in grams of one mole of the element

If the atomic weight of chlorine is 35.5 amu, what is the mass of one mole of chlorine?

• 35.5 grams

• 70 grams

• 17.75 grams

• 71 grams

How many grams does one mole of gold weigh if its atomic weight is 197 amu?

• 199 grams

• 197 grams

• 200 grams

• 195 grams

What is the molecular formula of glucose?

• C5H10O5

• C6H12O6

• C6H6O6

• C12H22O11

What is the unit of molar mass?

• Moles per liter

• Grams per mole

• Atomic mass units

• Moles per gram

How many carbon atoms are present in one molecule of glucose?

• 12

• 5

• 10

• 6

What is the total atomic mass of hydrogen atoms in one molecule of glucose?

• 6.0 amu

• 24.0 amu

• 18.0 amu

• 12.0 amu

What is the formula weight of one molecule of glucose?

• 200.0 amu

• 160.0 amu

• 150.0 amu

• 180.0 amu

What is the molar mass of glucose in grams?

• 150.0 grams

• 160.0 grams

• 200.0 grams

• 180.0 grams