Chemical Composition and Atomic Mass

The video tutorial explains how to calculate the molar mass of potassium carbonate (K2CO3). It begins by identifying the atomic masses of potassium, carbon, and oxygen. The tutorial then demonstrates how to multiply these atomic masses by their respective subscripts in the chemical formula. Finally, it adds the results to find the total molar mass of K2CO3, which is 138.8 grams per mole. The video concludes with a reminder to include units in the final answer.

What is the atomic mass of potassium as mentioned in the video?

• 40.08

• 39.10

• 12.01

• 16.00

How many potassium atoms are present in the formula K2CO3?

• 3

• 4

• 2

• 1

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

• 39.10

• 12.01

• 16.00

• 14.01

What is the subscript for oxygen in the chemical formula K2CO3?

• 1

• 2

• 3

• 4

What is the final molar mass of K2CO3 as calculated in the video?

• 138.8 g/mol

• 120.3 g/mol

• 150.5 g/mol

• 100.2 g/mol