Calculating Molar Mass of Propane

In this video, Dr. B demonstrates how to calculate the molar mass of propane (C3H8). The process begins by identifying the atomic masses of carbon and hydrogen from the periodic table. Carbon has an atomic mass of 12.01 grams per mole, and hydrogen has 1.01 grams per mole. The calculation involves multiplying the atomic mass of carbon by three and hydrogen by eight, then summing the results to find the total molar mass of C3H8, which is 44.11 grams per mole. Dr. B notes that variations in periodic tables may lead to slight differences in the final result.

What is the first step in calculating the molar mass of propane (C3H8)?

• Convert grams to moles.

• Multiply the atomic masses by the number of atoms.

• Find the atomic masses of carbon and hydrogen.

• Add the masses of carbon and hydrogen.

How many carbon atoms are present in propane (C3H8)?

• 3

• 2

• 1

• 4

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

• 1.00 grams per mole

• 1.01 grams per mole

• 1.03 grams per mole

• 1.02 grams per mole

What is the total mass of carbon in propane when calculated?

• 48.04 grams per mole

• 36.03 grams per mole

• 12.01 grams per mole

• 24.02 grams per mole

What is the final molar mass of propane (C3H8) as calculated in the video?

• 45.11 grams per mole

• 44.11 grams per mole

• 43.11 grams per mole

• 42.11 grams per mole

Why might your calculated molar mass differ slightly from the one in the video?

• Different periodic tables may have different atomic masses.

• Calculation errors.

• Different chemical formulas.

• Incorrect multiplication.