Mole Conversions and Percent Composition

What is the percent composition by mass of sulfur (S) in the compound MgSO₄?

• 20.22%

• 19.85%

• 26.64%

• 28.64%

What is the percent composition of Benzene, C₆H₆?

• C = 50%
  H = 50%
• C = 85.7 %
  H = 14.3%
• C = 92.2%
  H = 7.7%

• C = 71.9%
  H = 28.1%

• 84g

• .8401g

• 84.01g

• 81.04g

What percentage of the total atomic mass of carbon monoxide (CO) is composed of carbon?

• 29%

• 43%

• 57%

• 73%

Tags

CCSS.6.RP.A.3C

How many grams are there in 1.6 moles of CaO? (rounded)

• 35
• 56
• 90
• 0.286

How many moles are in 19.82 g Mg?

• 1.23 mol Mg

• 481.70 mol Mg

• 1.00 mol Mg

• 0.82 mol Mg

How many molecules are in 2.5 mol of NaCl?

• 1.50 x10²⁴ molecules

• 1.50 molecules

• 4.15 molecules

• 1.51 x10²⁴ molecules

Tags

CCSS.7.RP.A.3

Find the percent composition of Cu₂S?

• %Cu= 67.987 %S= 32.013
• %Cu= 79.853   %S= 20.147

• %Cu= 35.946   %S= 64.054

How many moles are in 2.2x10²⁴ atoms of argon?

g

h

d

i

0.27 moles

6.02x10²³ moles

6.02x10²³ molecules

6.02x10²³ atoms

6.02x10²³ formula units

1 mole

6.02x10²³ compounds

2.2x10²⁴ atoms

3.7 moles

1.3x10⁴⁸ moles

Which conversion factor (box) should be used to solve the following, "How many moles of argon are present in 11.2 L ?"

• 1 mol = 22.4 L

• 1 mol = 39.95 g

• 1 mol = 6.02x10²³ atoms

• More than 1