Mole Chalk Lab

A sample of calcium oxide (CaO) has a mass of 2.80 g. The molar mass of CaO is 56.08 g/mol. How many moles of CaO does this sample contain?

• 0.0499

• 20.0

• 58.9

• 157

In a Mole Chalk Lab, you start with 5.00 g of calcium carbonate (CaCO3). The molar mass of CaCO3 is 100.09 g/mol. How many moles of CaCO3 do you have?

• 0.0500

• 0.500

• 5.00

• 50.0

During the Mole Chalk Lab, you react calcium carbonate with hydrochloric acid. What gas is produced in this reaction?

• Oxygen

• Carbon dioxide

• Hydrogen

• Nitrogen

Tags

NGSS.MS-PS1-2

If you have 0.25 moles of calcium carbonate, how many grams of calcium carbonate do you have? (Molar mass of CaCO3 = 100.09 g/mol)

• 25.0 g

• 50.0 g

• 75.0 g

• 100.0 g

In the Mole Chalk Lab, what is the primary purpose of using hydrochloric acid?

• To dissolve the chalk

• To neutralize the base

• To produce carbon dioxide

• To increase the temperature

What is the balanced chemical equation for the reaction between calcium carbonate and hydrochloric acid?

• @@ ext{CaCO}_3 + ext{HCl} ightarrow ext{CaCl}_2 + ext{H}_2 ext{O} + ext{CO}_2@@

• @@ ext{CaCO}_3 + 2 ext{HCl} ightarrow ext{CaCl}_2 + ext{H}_2 ext{O} + ext{CO}_2@@

• @@ ext{CaCO}_3 + ext{HCl} ightarrow ext{CaCl}_2 + ext{CO}_2 + ext{H}_2 ext{O}@@

• @@ ext{CaCO}_3 + 2 ext{HCl} ightarrow ext{CaCl}_2 + ext{CO}_2 + ext{H}_2 ext{O}@@

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In the context of the Mole Chalk Lab, what is the role of calcium carbonate?

• Acid

• Base

• Reactant

• Product

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many moles of carbon dioxide are produced from 1 mole of calcium carbonate in the Mole Chalk Lab reaction?

• 0.5 moles

• 1 mole

• 1.5 moles

• 2 moles

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the theoretical yield of carbon dioxide if 10.0 g of calcium carbonate is used in the Mole Chalk Lab? (Molar mass of CaCO3 = 100.09 g/mol, molar mass of CO2 = 44.01 g/mol)

• 4.40 g

• 8.80 g

• 10.0 g

• 20.0 g

Tags

NGSS.MS-PS1-5

In the Mole Chalk Lab, if the actual yield of carbon dioxide is 3.5 g, what is the percent yield? (Theoretical yield = 4.40 g)

• 79.5%

• 85.0%

• 90.0%

• 95.5%

Tags

NGSS.MS-PS1-2