Mastering Mole Conversions: Grams to Moles and Back

What is the role of moles in chemistry?

• To measure the volume of a substance

• To convert between tiny levels like atoms and measurable quantities

• To calculate the speed of a reaction

• To determine the color of a substance

What is the molar mass of nitrogen?

• 12.01 grams per mole

• 16.00 grams per mole

• 14.01 grams per mole

• 1.01 grams per mole

How many grams of lead are in 1.42 moles of lead?

• 1.42 grams

• 294 grams

• 142 grams

• 207.2 grams

What is the first step in converting grams to moles?

• Multiply by Avogadro's number

• Add the atomic mass

• Use the molar mass from the periodic table

• Divide by the atomic number

How many moles of zinc are in 5.78 grams of zinc?

• 0.0088 moles

• 8.84 moles

• 0.884 moles

• 0.088 moles

What is the two-step process to convert grams to atoms?

• Grams to atoms directly

• Grams to molecules, then molecules to atoms

• Grams to liters, then liters to atoms

• Grams to moles, then moles to atoms

How many atoms are in an aluminum can with a mass of 14.1 grams?

• 6.02 x 10^23 atoms

• 2.98 x 10^23 atoms

• 1.41 x 10^23 atoms

• 3.15 x 10^23 atoms

What is the first step in converting atoms to grams?

• Use Avogadro's number to convert to moles

• Use the molar mass to convert to grams

• Multiply by the atomic number

• Divide by the atomic mass

How many grams are in a sample of copper containing 1.25 x 10^24 atoms?

• 132 grams

• 63.55 grams

• 207.2 grams

• 294 grams

What should you be cautious about when dealing with exponents in the denominator?

• Using the correct units

• Using parentheses or the EE function in your calculator

• Adding the atomic mass

• Multiplying by Avogadro's number