Calculating Molecular Weight of CH4

The video tutorial explains how to calculate the molecular weight of CH4. It begins by identifying the atomic weights of carbon and hydrogen from the periodic table. Carbon is 12.01 g/mol, and hydrogen is 1.01 g/mol. Since CH4 has four hydrogen atoms, the hydrogen weight is multiplied by four. The total molecular weight is calculated by adding the atomic weights, resulting in 16.05 g/mol. The importance of using correct units is emphasized throughout the process.

What is the atomic weight of carbon as found on the periodic table?

• 4.04 g/mol

• 16.05 g/mol

• 12.01 g/mol

• 1.01 g/mol

Why do we multiply the atomic weight of hydrogen by four in the calculation for CH4?

• To account for the four hydrogen atoms in CH4

• To simplify the calculation

• Because hydrogen is heavier than carbon

• Because the periodic table lists it incorrectly

What should be done first when calculating the molecular weight of CH4?

• Addition of atomic weights

• Multiplication of hydrogen's atomic weight

• Finding the atomic weights on the periodic table

• Converting units

What is the result of adding 12.01 and 4.04 in the calculation of CH4's molecular weight?

• 18.05 g/mol

• 17.05 g/mol

• 16.05 g/mol

• 15.05 g/mol

What is the importance of including units in the final molecular weight calculation?

• It is not important

• It is required for scientific notation

• It ensures the calculation is correct

• It helps in identifying the element