Percentage

What is the general formula for the computation of percentage composition of the given element?

• % mass of element = mass of element in the compound divided by mass of the compound times 100

• % mass of element = mass of element in the compound divided by mass of the compound

• % mass of element = mass of element in the compound divided by 100

• % mass of element = mass of element in the compound

Which of the following is NOT needed to calculate percent composition?

• Mass of specific element

• Molar Mass

• Avogadro's Number

• Division

What is 15% of 100?

• 15

• 1.5

• 100

What is 11% of 25?

• .11

• .011

• 25

• 2.75

What is 35% of 200?

• 35

• 0.35

• 70

• 200

What is 40% of 50?

• .40

• 20

• 2.0

• 50

What is 42% of 100?

• 42

• .42

• 100

• 4.2

What is 56% of 250?

• .56

• 56

• 140

• 250

What is 8% of 25?

• 2

• 8

• 0.08

• 25

What percent is white?

• 3%

• 75%

• 0.75%

• 25%