Percent Composition in Sodium Nitrate

The video tutorial explains how to calculate the percent composition by mass of each element in sodium nitrate (Na3). It covers the calculation process for sodium, nitrogen, and oxygen, using their atomic masses and the molar mass of sodium nitrate. The tutorial provides step-by-step instructions, including multiplying atomic masses by the number of atoms, dividing by the molar mass, and converting to a percentage. The video concludes by ensuring the sum of percentages is close to 100%.

What is the first step in finding the percent composition by mass of an element in a compound?

• Find the atomic number of the element.

• Determine the molar mass of the compound.

• Calculate the volume of the compound.

• Identify the color of the compound.

How do you calculate the percent composition of sodium in sodium nitrate?

• Add the atomic masses of all elements in sodium nitrate.

• Subtract the atomic mass of oxygen from the molar mass of sodium nitrate.

• Multiply the atomic mass of sodium by the number of sodium atoms and divide by the molar mass of sodium nitrate.

• Divide the atomic mass of sodium by the atomic mass of nitrogen.

What is the percent composition of sodium in sodium nitrate?

• 27.5%

• 16.48%

• 56.47%

• 85.00%

What is the atomic mass of nitrogen used in the calculation for sodium nitrate?

• 22.99

• 85.00

• 16.00

• 14.01

What is the percent composition of nitrogen in sodium nitrate?

• 16.48%

• 27.5%

• 56.47%

• 85.00%

How many oxygen atoms are present in sodium nitrate?

• Four

• Three

• Two

• One

What is the percent composition of oxygen in sodium nitrate?

• 16.48%

• 27.5%

• 56.47%

• 85.00%

What should the sum of the percent compositions of all elements in a compound be close to?

• 50%

• 75%

• 150%

• 100%