Understanding Ni(OH)₂ and Avogadro's Number

The video tutorial explains how to determine the number of atoms in Nickel(II) Hydroxide, Ni(OH)2. It begins by identifying the elements present and their respective subscripts. The tutorial then explains the significance of parentheses in chemical formulas, particularly for the hydroxide group, and how to calculate the total number of atoms in the compound. Finally, it demonstrates how to calculate the number of oxygen atoms in one mole of Ni(OH)2 using Avogadro's number.

What elements are present in the compound Ni(OH)₂?

• Nickel, Oxygen, Helium

• Nickel, Oxygen, Helium

• Nickel, Oxygen, Hydrogen

• Nitrogen, Oxygen, Hydrogen

If no subscript is written after an element in a chemical formula, what does it imply?

• The subscript is zero

• The subscript is two

• The subscript is one

• The element is not present

How many oxygen atoms are there in Ni(OH)₂?

• Two

• Three

• One

• Four

In the context of Ni(OH)₂, what does the '2' outside the parentheses indicate?

• Two moles of Ni(OH)₂

• Two atoms of nickel

• Two hydroxide groups

• Two molecules of Ni(OH)₂

What is the total number of atoms in a molecule of Ni(OH)₂?

• Three

• Four

• Six

• Five

How do you calculate the number of oxygen atoms in one mole of Ni(OH)₂?

• Subtract Avogadro's number from the number of oxygen atoms

• Divide the number of oxygen atoms by Avogadro's number

• Add Avogadro's number to the number of oxygen atoms

• Multiply the number of oxygen atoms by Avogadro's number

What is Avogadro's number used for?

• To find the volume of a gas

• To calculate the mass of a compound

• To measure the density of a liquid

• To determine the number of atoms in a mole