Molecular Formula Percent Composition

What is the percent composition of Benzene, C₆H₆?

• C = 50%

  H = 50%

• C = 85.7 %

  H = 14.3%

• C = 92.2%

  H = 7.8%

• C = 71.9%

  H = 28.1%

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

What is the percent by mass of magnesium in MgO?

• 20%

• 40%

• 50%

• 60%

What is the percent by mass of chlorine in NaCl?

• 39%

• 61%

• 35%

• 35%

Tags

NGSS.HS-PS1-7

Find the percent composition of Aspirin C9H8O4?

• 180 g/mol

• Molar Mass of C9

• 60%

• H

• 108 g/mol

• O

• 35.6%

• Molar Mass of Aspirin

• 4.4%

• C

Complete the formula for % Composition.

a

b

c

total mass of compound

mass of element

100

Tags

NGSS.HS-PS1-7

(Page 38-40) Complete the formula for % Composition.

a

b

c

total mass of compound

mass of element

100

• 25%

• 20%

• 75%

• 14.3%

The percent, by weight, of carbon in C₄H₈O₃ is (a)   .

• 55%

• 72%

• 31%

• 46%

What is the percent by mass of fluorine in CaF₂ (gram-formula mass = 78 g/mol)?

• 24%

• 49%

• 49%

• 65%