Chapter 10 Review

Find the mass of 5.82 mol of MgCl₂.

• 554 g

• 436. g

• 55.2 g

• 555.9 g

How many molecules are there in 31.8 moles of water?

• 5.28 x 10^-23 molecules
• 1.91 x 10²⁵ molecules
• 5.28x 10-²⁵
• 1.91 x 10²²

How many moles are in 98.3 grams of aluminum hydroxide, Al(OH)₃?

• 1.26 moles

• 0.8 moles

• 7,670 moles

• 1.63 x 10^-22 moles

How many molecules are in 84.0 g of C₅H₅N?

• 4.00 x 10²⁷ molecules
• 6.40 x 10²³ molecules
• 1.10 x 10^-20 molecules
• 5.06 x 10²⁵ molecules

What is the molar mass of Hydrogen Peroxide (H₂O₂)?

• 48 g/mole
• 34.02 g/mole
• 36.5 g/mole
• 35.5 g/mole

How many grams are in 3.30 x10²³ molecules of N₂I₃

• 126g
• 261g
• 789g
• 224g

How many molecules are in 2.5 mol of NaCl?

• 1.51x10²³
• 146
• 4.15
• 1.51x10²⁴

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%

Find the percent composition of Cu₂S?

• %Cu= 67.987 %S= 32.013
• %Cu= 79.854   %S= 20.145
• %Cu= 35.946   %S= 64.054

Which pair has the same empirical formula?

• NaCrO₄ and Na₂Cr₂O₇
• C₂H₄O₂ and C₆H₁₂O₆
• C₃H₆O₃ and C₂H₆O₂
• CH₄ and C₂H₆