Understanding Potassium Nitrate and Atoms

The video tutorial explains how to determine the number of atoms in potassium nitrate (KNO3). It begins by identifying the elements present in KNO3: potassium, nitrogen, and oxygen. The tutorial then demonstrates how to calculate the total number of atoms in a KNO3 molecule by considering the subscripts of each element. Finally, it explains how to find the number of specific atoms in one mole of KNO3 using Avogadro's number, focusing on oxygen and nitrogen atoms.

Which elements are present in potassium nitrate (KNO3)?

• Potassium, Hydrogen, and Oxygen

• Sodium, Nitrogen, and Oxygen

• Potassium, Nitrogen, and Oxygen

• Potassium, Nitrogen, and Sulfur

What does the subscript '3' in KNO3 indicate?

• Three potassium atoms

• Three nitrogen atoms

• Three oxygen atoms

• Three hydrogen atoms

Which of the following is true about the subscripts in chemical formulas?

• They indicate the charge of the atoms

• They indicate the number of molecules

• They indicate the number of each type of atom

• They indicate the weight of the atoms

How many total atoms are there in a single molecule of KNO3?

• Seven

• Six

• Five

• Four

How would you calculate the number of oxygen atoms in one mole of KNO3?

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

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

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

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

If you have one mole of KNO3, how many nitrogen atoms do you have?

• Five times Avogadro's number

• Three times Avogadro's number

• Avogadro's number

• One

What is the role of Avogadro's number in calculating atoms in a mole?

• It is used to calculate the density of a mole

• It is used to calculate the mass of a mole

• It is used to calculate the volume of a mole

• It is used to calculate the number of atoms in a mole