Chemical Composition and Formulas

The video tutorial explains how to determine the number of atoms in the compound Al2(SO3)3, known as aluminum sulfite. It begins by identifying the element symbols and their respective subscripts. The tutorial then demonstrates how to calculate the total number of atoms by considering the subscripts and the multiplication factor from the parentheses. Additionally, it covers how to find the number of sulfur atoms in one mole of aluminum sulfite using Avogadro's number. The video concludes with a summary of the calculations.

What is the chemical formula for aluminum sulfite?

• Al2(SO4)3

• Al(SO3)2

• Al(SO4)2

• Al2(SO3)3

How many aluminum atoms are present in the compound Al2(SO3)3?

• 2

• 1

• 4

• 3

What is the subscript for sulfur in the compound Al2(SO3)3?

• 2

• 1

• 4

• 3

How many oxygen atoms are there in Al2(SO3)3?

• 3

• 12

• 9

• 6

What is the total number of atoms in one formula unit of Al2(SO3)3?

• 18

• 12

• 14

• 16

How do you calculate the number of sulfur atoms in one mole of Al2(SO3)3?

• Multiply by 6

• Multiply by Avogadro's number

• Multiply by 2

• Multiply by 3

What is Avogadro's number used for in this context?

• To measure the volume of a gas

• To determine the number of atoms in a mole

• To calculate the number of moles

• To find the mass of aluminum