Mole Conversions and Molar Mass Calculation

What does the term 'mole' represent in chemistry?

• The mass of a substance

• The volume of a gas

• 6.02 x 10^23 representative particles

• The number of atoms in a molecule

Which of the following is Avogadro's number?

• 3.14 x 10^8

• 6.02 x 10^23

• 1.67 x 10^-24

• 9.81 x 10^2

Why is it important to understand the concept of the mole in chemical reactions?

• To determine the number of particles needed for a specific amount of product

• To identify the color of compounds

• To calculate the speed of reactions

• To measure the temperature of reactions

What is molar mass?

• The volume of one mole of a gas

• The mass of one mole of a substance

• The mass of one atom

• The density of a substance

How is the molar mass of an element determined?

• By measuring its volume

• By calculating its density

• By counting its atoms

• By looking at the average atomic mass on the periodic table

What is the molar mass of carbon if its atomic mass is 12.01 amu?

• 1.20 grams

• 12.01 grams

• 24.02 grams

• 6.00 grams

Why does the molar mass of an ion remain unchanged despite gaining or losing electrons?

• Because the atomic number changes

• Because the number of protons changes

• Because electrons are very small compared to protons

• Because ions do not have mass

How do you calculate the molar mass of a molecule like CO2?

• By adding the atomic masses of all atoms in the molecule

• By measuring the volume of the molecule

• By determining the density of the molecule

• By counting the number of molecules

What is the molar mass of water (H2O) if the atomic masses are H: 1.01 and O: 16.00?

• 18.02 grams

• 20.02 grams

• 17.01 grams

• 19.00 grams

When calculating the molar mass of a compound, what should you do after finding the atomic masses of each element?

• Multiply the atomic masses by the number of atoms and add them together

• Divide the atomic masses by the number of atoms

• Ignore the atomic masses and use the molecular formula

• Subtract the atomic masses from each other