Calculating Formula Weight of Citric Acid

This video tutorial demonstrates how to calculate the formula weight of a compound, using citric acid as an example. It begins by identifying the number of carbon, hydrogen, and oxygen atoms in citric acid. The concept of formula weight is explained as the sum of the atomic masses of all atoms in a compound. The tutorial then guides viewers through using a periodic table to find atomic masses and perform calculations to determine the formula weight of citric acid, rounding to the nearest gram per mole.

What is the primary focus of the video tutorial?

• How to determine the pH of a solution

• How to balance chemical equations

• How to identify chemical reactions

• How to calculate the formula weight of a compound

How many carbon atoms are present in a molecule of citric acid?

• Six

• Four

• Seven

• Five

What is the total number of hydrogen atoms in citric acid?

• Nine

• Eight

• Seven

• Six

What does the formula weight of a compound represent?

• The density of the compound

• The volume of the compound

• The mass in grams of a mole of the compound

• The number of atoms in a molecule

Which element's atomic mass is rounded to 12 in the calculation?

• Hydrogen

• Oxygen

• Carbon

• Nitrogen

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

• 1.007

• 2

• 1

• 1.5

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

• 14

• 17

• 15

• 16

How is the formula weight of citric acid calculated?

• By subtracting the atomic masses from each other

• By dividing the total mass by the number of atoms

• By multiplying the number of atoms by their atomic masses and summing the results

• By adding the atomic numbers of all atoms

What is the final formula weight of citric acid to the nearest gram per mole?

• 180 grams per mole

• 200 grams per mole

• 190 grams per mole

• 192 grams per mole

Which of the following is NOT a step in calculating the formula weight?

• Measuring the volume of the compound

• Multiplying atomic masses by the number of atoms

• Finding atomic masses from the periodic table

• Identifying the number of each type of atom