Chemical Formula Mass and Atomic Mass

The video tutorial explains how to calculate the gram formula mass of compounds. It begins with an introduction to the concept of formula mass and molar mass. The instructor then demonstrates the calculation process using ammonium sulfate, detailing the distribution of atoms and multiplication by atomic masses. Finally, the same process is applied to phosphoric acid, resulting in the calculation of its gram formula mass.

What is the unit for molar mass?

• Kilograms

• Liters

• Grams per mole

• Amu

When distributing numbers outside parentheses in a chemical formula, what should you do?

• Divide them by the number of elements

• Add them to the elements inside the parentheses

• Multiply them with the elements inside the parentheses

• Ignore the numbers

What is the first step in calculating the gram formula mass?

• Find the molar mass

• Multiply atomic masses by the number of atoms

• Distribute numbers outside parentheses

• Add all atomic masses

How many hydrogens are there in ammonium sulfate after distribution?

• 10

• 8

• 6

• 4

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

• 16.00

• 14.01

• 32.07

• 12.01

Which element has an atomic mass of 16.00?

• Hydrogen

• Nitrogen

• Oxygen

• Sulfur

What is the gram formula mass of ammonium sulfate?

• 132.17

• 98.00

• 28.02

• 64.00

How many hydrogens are present in phosphoric acid?

• 3

• 1

• 4

• 2

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

• 16.00

• 32.07

• 30.97

• 1.01

What is the gram formula mass of phosphoric acid?

• 132.17

• 30.97

• 98.00

• 64.00