Mastering Percent Composition by Mass

What is the compound used as an example to explain percent composition?

• Hydrogen peroxide (H2O2)

• Carbon dioxide (CO2)

• Sodium chloride (NaCl)

• Potassium oxide (K2O)

What is the first step in calculating the percent composition of an element in a compound?

• Calculate the molar mass of the compound.

• Divide the element's mass by the compound's mass.

• Find the total mass of the element.

• Multiply the result by 100.

How many times is the molar mass of potassium multiplied in the example?

• Three times

• Five times

• Two times

• Four times

What is the total mass of potassium used in the calculation?

• 78.20

• 39.10

• 156.40

• 16.00

What is the next step after finding the total mass of potassium?

• Find the total mass of the compound.

• Subtract the mass of oxygen.

• Divide by 100.

• Multiply by the molar mass of oxygen.

What is the mass of oxygen used in the percent composition calculation?

• 16.00

• 64.00

• 32.00

• 48.00

What mathematical operation is performed after plugging in the masses into the formula?

• Divide, then multiply by 100

• Add, then subtract by 100

• Multiply, then divide by 100

• Subtract, then add by 100

What is encouraged if the viewer is up for a challenge after learning about percent composition?

• Read a textbook

• Watch another video

• Review the tutorial

• Take a quiz