Molar Mass and Atomic Mass Concepts

The video tutorial explains how to calculate the molar mass of sodium nitrite (NaNO2). It begins by identifying the molar masses of individual elements: sodium, nitrogen, and oxygen, using the periodic table. The tutorial then demonstrates how to sum these values, considering the number of each type of atom in the compound, to arrive at the total molar mass of 69.00 grams per mole. The importance of maintaining consistent decimal places is also highlighted.

What is the atomic mass of sodium as found on the periodic table?

• 69.00 grams per mole

• 16.00 grams per mole

• 22.99 grams per mole

• 14.01 grams per mole

How many oxygen atoms are present in sodium nitrite (NaNO2)?

• Four

• Two

• Three

• One

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

• 22.99 grams per mole

• 16.00 grams per mole

• 14.01 grams per mole

• 69.00 grams per mole

Why is it important to write the molar mass with two decimal places?

• To make the number look more precise

• To follow standard scientific notation

• To match the atomic masses of individual elements

• To avoid rounding errors

What is the final calculated molar mass of NaNO2?

• 22.99 grams per mole

• 69.00 grams per mole

• 14.01 grams per mole

• 16.00 grams per mole