Chemical Formulas and Moles

The video tutorial explains how to find the number of atoms in copper II hydroxide (CuOH2). It begins by identifying the element symbols and subscripts, then calculates the total number of atoms in the compound. The tutorial also covers how to use Avogadro's number to determine the number of oxygen atoms in one mole of CuOH2. The video concludes with a summary of the calculations and a thank you message.

What is the chemical formula for copper II hydroxide?

• Cu2OH

• Cu(OH)2

• CuO2H

• CuOH

In the formula Cu(OH)2, what does the subscript '2' indicate?

• Two oxygen atoms only

• Two hydrogen atoms only

• Two hydroxide groups

• Two copper atoms

How many copper atoms are present in one formula unit of Cu(OH)2?

• Three

• Two

• One

• Four

What is the total number of atoms in one formula unit of Cu(OH)2?

• 6

• 3

• 4

• 5

How many oxygen atoms are there in one formula unit of Cu(OH)2?

• Two

• Four

• Three

• One

To find the number of oxygen atoms in one mole of Cu(OH)2, which constant is used?

• Gravitational constant

• Avogadro's number

• Boltzmann's constant

• Planck's constant

What is the purpose of multiplying the number of atoms by Avogadro's number?

• To find the charge of the atoms

• To find the number of atoms in a mole

• To find the volume of the atoms

• To find the mass of the atoms