Percentage Composition

What is the percent by mass of magnesium in MgO?

• 20%

• 40%

• 50%

• 60%

Tags

NGSS.HS-PS1-7

Find the percent composition of Cu₂S?

• %Cu= 67.987 %S= 32.013

• %Cu= 79.854 %S= 20.145

• %Cu= 35.946 %S= 64.054

Tags

NGSS.HS-PS1-7

How many percent of chlorine is present in chloroform?

• 10.06%

• 0.84%

• 89.09%

• 99.99%

Tags

NGSS.HS-PS1-7

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%

The mass % of aluminum in aluminum sulfate is:

• 35.94%

• 15.77%

• 45.70 %

• 21.93 %

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

Sodium chloride is a common salt and has vast variety of applications. The molecular formula of sodium chloride is NaCl. The molar mass of NaCl is M_NaCl = 22.99 + 35.45 = 58.44 g mol⁻¹. What percent constitute sodium(Na) in a sodium chloride ions?

• 39. 34%

• 49.35%

• 50%

• 63.15%

Percentage composition of a compound tells you the percentage of the mass made up by each element in a compound.

• TRUE

• FALSE