Molar Mass and Atomic Contributions

This video tutorial explains how to calculate the molar mass of ethane (C2H6). It begins by identifying the atomic masses of carbon and hydrogen from the periodic table. The video then demonstrates multiplying these atomic masses by the number of each type of atom in the molecule. Finally, it adds these values together to find the total molar mass of C2H6, which is 30.08 grams per mole.

What is the first step in finding the molar mass of a compound like ethane?

• Directly add the number of atoms.

• Look up the atomic masses of the elements involved.

• Multiply the number of atoms by 10.

• Use a calculator to find the mass.

How many carbon atoms are present in ethane (C2H6)?

• 6

• 3

• 2

• 1

What is the atomic mass of hydrogen used in the calculation?

• 1.01 grams per mole

• 12.01 grams per mole

• 6.06 grams per mole

• 24.02 grams per mole

What is the total mass contribution of the hydrogen atoms in ethane?

• 12.01 grams per mole

• 6.06 grams per mole

• 24.02 grams per mole

• 30.08 grams per mole

What is the final molar mass of ethane (C2H6) after summing all contributions?

• 12.01 grams per mole

• 24.02 grams per mole

• 6.06 grams per mole

• 30.08 grams per mole

What is the significance of adding units at the end of the calculation?

• It makes the calculation more complex.

• It is not necessary.

• It provides the correct context for the calculated value.

• It helps in identifying the compound.