Calculating Molar Mass

What is the atomic mass of carbon (C)?

• 10.81 g/mol

• 12.01 g/mol

• 14.01 g/mol

• 16.00 g/mol

What is the molar mass of aluminum (Al)?

• 24 g/mol

• 27 g/mol

• 30 g/mol

• 32 g/mol

What is the significance of molar mass in chemical reactions?

• It is used to determine the color of the reactants.

• It helps in calculating the temperature of the reaction.

• Molar mass is used to convert between grams and moles, allowing chemists to calculate the amounts of reactants and products in a chemical reaction.

• It indicates the speed of the reaction.

What is the atomic mass of oxygen (O)?

• 12.01 g/mol

• 14.01 g/mol

• 16.00 g/mol

• 18.02 g/mol

How do you calculate the molar mass of a compound?

• Identify the elements in the compound, find their atomic masses on the periodic table, and sum the total mass based on the number of each type of atom present.

• Multiply the number of atoms by their atomic masses and divide by the total number of atoms.

• Add the atomic masses of the most abundant isotopes of each element in the compound.

• Use the formula weight of the compound and divide by the number of moles.

If a compound has a molar mass of 58.44 g/mol, what could it be?

• NaCl (Sodium chloride)

• KCl (Potassium chloride)

• CaCl2 (Calcium chloride)

• MgCl2 (Magnesium chloride)

What is the molar mass of a diatomic molecule like O2?

• 28 g/mol (2 x 14 g/mol)

• 30 g/mol (2 x 15 g/mol)

• 32 g/mol (2 x 16 g/mol)

• 34 g/mol (2 x 17 g/mol)

Calculate the molar mass of CuO (Copper(II) oxide).

• 63.55 g/mol

• 79.55 g/mol

• 88.00 g/mol

• 72.00 g/mol

Why is it important to know the molar mass when performing stoichiometric calculations?

• It allows for accurate conversions between grams and moles, which is essential for stoichiometric calculations in chemical reactions.

• It helps in determining the color of the chemical reactions.

• It is necessary for calculating the temperature of the reaction.

• It provides information about the physical state of the reactants.

Calculate the molar mass of water (H2O).

• 16 g/mol

• 18 g/mol

• 20 g/mol

• 22 g/mol