Bell Ringer 4-18-24

What does a mole tell us in a chemical reaction?

• The volume of the substances involved

• The number of particles, atoms, or molecules involved

• The temperature at which the reaction occurs

• The duration of the reaction

What is the numerical value of Avogadro's number?

• 3.01 x 10^23 particles

• 6.02 x 10^22 particles

• 6.02 x 10^23 particles

• 6.02 x 10^24 particles

What is molar mass?

• The mass of one molecule of a substance

• The mass of one atom of a substance

• The mass of one mole of a substance

• The mass of one liter of a substance

For any element, the molar mass is numerically equal to the element's what?

• Atomic number in grams

• Atomic mass in grams

• Number of protons in grams

• Number of electrons in grams

What are the steps to calculate the molar mass of compounds?

• Count the atoms, look up the molar mass, multiply by the number of atoms, add the masses

• Count the molecules, divide by Avogadro's number, multiply by the atomic mass, sum the masses

• Look up the atomic number, multiply by Avogadro's number, divide by the molar mass, sum the masses

• Multiply the atomic mass by Avogadro's number, divide by the number of molecules, sum the masses

Calculate the molar mass of NO2.

• 30.01 g/mol

• 46.01 g/mol

• 64.01 g/mol

• 16.00 g/mol

Calculate the molar mass of SO2.

• 64.07 g/mol

• 60.07 g/mol

• 32.07 g/mol

• 48.07 g/mol

Calculate the molar mass of C6H12O6.

• 180.16 g/mol

• 162.14 g/mol

• 342.30 g/mol

• 150.13 g/mol

When converting grams to moles, what unit are you given?

• Moles

• Liters

• Grams

• Molecules

Explain how to convert moles to molar mass.

• Divide the number of grams by the number of moles.

• Multiply the number of moles by Avogadro's number.

• Divide the number of moles by the number of grams.

• Multiply the molar mass by the number of moles.