Chemistry Coach Murray

How many moles are in 225 g of CO?

• 28.01 mole

• 4.82 x 10²⁴ mole

• 6,302,25 mole

• 8.0357 mole

What is the total number of atoms in 1.0 mole of CO₂?

• 1.5 x 10²³
• 12 x 10²³
• 3 x 10²³
• 18 x 10²³

Tags

NGSS.MS-PS1-1

The total number of sodium atoms in 46.0 grams is

• 3.01 x 10²³
• 6.02 x 10²³
• 12 x 10²³
• 24 x 10²³

Which sample of O₂ contains a total of 3 x 10²³ molecules?

• 1.0 moles
• 2.0 moles
• 16.0 grams
• 32.0 grams

Which represents the greatest mass of chlorine?

• 1 mole of chlorine
• 1 atom of chlorine
• 1 grams of chlorine
• 1 molecule of chlorine

What is the percent composition of Benzene, C₆H₆?

• C = 50%

  H = 50%

• C = 85.7 %

  H = 14.3%

• C = 92.3%

  H = 7.7%

• C = 71.9%

  H = 28.1%

If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the

• theoretical yield

• mole ratio

• actual yield

• percentage yield

What is the measured amount of a product obtained from a chemical reaction?

• mole ratio
• theoretical yield
• percentage yield
• actual yield

Tags

NGSS.HS-PS1-7

Mole ratios are obtained from the

• balanced chemical equation
• periodic table
• molar mass

When does a chemical reaction stop?

• When the lab is finished
• When the excess reactant is used up
• When the limiting reactant is used up
• Chemical reactions never stop

Tags

NGSS.HS-PS1-7