Molar Mass Practice

The video tutorial introduces the concept of molecular mass, explaining its definition and how it is calculated. The instructor provides examples of calculating molecular mass for various compounds, including complex ones with water of crystallization. The video aims to make chemistry engaging and encourages viewers to practice more problems for better understanding.

What is the definition of molecular mass?

• The volume of a molecule in liters

• The weight of a molecule in kilograms

• The mass of all atoms in a molecule measured in AMU

• The mass of a single atom in grams

How is an atomic mass unit (AMU) defined?

• 1/16 the mass of an oxygen atom

• 1/14 the mass of a nitrogen atom

• 1/12 the mass of a carbon-12 isotope

• 1/12 the mass of a hydrogen atom

Which of the following terms are calculated in the same manner?

• Molecular mass and atomic number

• Molar mass and molecular weight

• Formula mass and atomic radius

• Molecular weight and electron affinity

What is the molecular mass of carbon dioxide (CO2)?

• 16 AMU

• 32 AMU

• 44 AMU

• 28 AMU

How many atoms of oxygen are present in sulfuric acid (H2SO4)?

• 3

• 2

• 5

• 4

What is the molecular mass of glucose (C6H12O6)?

• 160 AMU

• 200 AMU

• 150 AMU

• 180 AMU

What is the term for water molecules associated with a compound?

• Hydration

• Water of crystallization

• Hydrolysis

• Dehydration

What is the molecular mass of Glauber salt (Na2SO4·10H2O)?

• 300 gram per mole

• 322 gram per mole

• 350 gram per mole

• 280 gram per mole

How many water molecules are associated with Glauber salt?

• 5

• 12

• 8

• 10

Which method can be used to calculate the molecular mass of compounds with water of crystallization?

• Calculating separately for water and adding

• Ignoring the water molecules

• Using the atomic mass of carbon

• Using only the atomic mass of sodium