Hydrates and Gram Formula Mass

The video tutorial explains how to calculate the gram formula mass of compounds, using calcium chloride and an aluminum hydrate as examples. It covers the step-by-step process of identifying the number of atoms in a compound, using the periodic table to find atomic masses, and performing calculations to determine the total gram formula mass. The tutorial also introduces the concept of hydrates and their significance in chemical compounds.

What is the first step in calculating the gram formula mass of a compound?

• Multiply the atomic number by the number of atoms.

• Identify the number of atoms of each element in the compound.

• Divide the atomic mass by the number of atoms.

• Add up the atomic numbers of all elements.

How do you determine the contribution of chlorine to the gram formula mass of calcium chloride?

• Add the atomic mass of chlorine to calcium.

• Multiply the atomic number of chlorine by 2.

• Subtract the atomic mass of chlorine from calcium.

• Multiply the atomic mass of chlorine by 2.

What does the gram formula mass of a compound indicate?

• The mass of one mole of the compound.

• The number of moles in a gram.

• The volume of the compound.

• The number of atoms in a molecule.

What is a hydrate in chemistry?

• A compound with water molecules in its structure.

• A compound with a high boiling point.

• A compound that dissolves in water.

• A compound with extra hydrogen atoms.

How many aluminum atoms are present in the aluminum carbonate hydrate example?

• Two

• Three

• Four

• One

What is the gram formula mass contribution of carbon in the aluminum carbonate hydrate?

• 12 G per mole

• 48 G per mole

• 24 G per mole

• 36 G per mole

How many water molecules are associated with each formula unit of the hydrate?

• Two

• Three

• Four

• Five

What is the total gram formula mass contribution of water in the hydrate?

• 108 G per mole

• 90 G per mole

• 72 G per mole

• 54 G per mole

What is the atomic mass of oxygen used in the calculations?

• 17 G per mole

• 14 G per mole

• 15 G per mole

• 16 G per mole

What is the final gram formula mass of the aluminum carbonate hydrate?

• 180 G per mole

• 216 G per mole

• 144 G per mole

• 252 G per mole