Calculating Formula Weight of Compounds

The video tutorial explains the concept of formula weight, which is the sum of the atomic masses of all atoms in a compound. It provides a step-by-step example using calcium phosphate (Ca3(PO4)2) to demonstrate how to calculate the formula weight. The tutorial covers the use of atomic mass units (amu) and the importance of knowing the molecular formula to determine the number of atoms of each element. The final calculation shows that the formula weight of calcium phosphate is 310 amu.

What is the formula weight of a compound?

• The average atomic mass of all atoms in a compound.

• The difference between the atomic masses of the heaviest and lightest atoms.

• The sum of the atomic masses of all atoms in a compound.

• The sum of the volumes of all atoms in a compound.

Which compound is used as an example to explain formula weight calculation?

• Carbon dioxide

• Water

• Calcium phosphate

• Sodium chloride

How many calcium atoms are present in calcium phosphate?

• Two

• Four

• Three

• One

How many phosphate groups are present in calcium phosphate?

• Four

• One

• Two

• Three

How many oxygen atoms are present in calcium phosphate?

• Ten

• Eight

• Six

• Four

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

• 20 amu

• 40 amu

• 60 amu

• 80 amu

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

• 31 amu

• 40 amu

• 16 amu

• 50 amu

What is the atomic mass of oxygen as used in the video?

• 16 amu

• 14 amu

• 12 amu

• 18 amu

What is the final formula weight of calcium phosphate calculated in the video?

• 320 amu

• 340 amu

• 310 amu

• 330 amu

Which of the following steps is NOT part of calculating the formula weight?

• Counting the number of atoms of each element.

• Multiplying the atomic mass by the number of atoms.

• Subtracting the smallest atomic mass from the largest.

• Adding the atomic masses of all elements.