Molar Mass and Chemical Composition

The video tutorial explains how to calculate the molar mass of ammonium hydroxide (NH4OH). It begins by identifying the atomic masses of nitrogen, hydrogen, and oxygen from the periodic table. The tutorial then demonstrates how to add these masses to find the total molar mass of NH4OH, which is 35.06 grams per mole. The significance of molar mass is also discussed, emphasizing that 35.06 grams of NH4OH is equivalent to one mole of the compound. The video concludes with a brief thank you from Dr. B.

What is the first step in finding the molar mass of NH4OH?

• Calculate the number of moles

• Measure the sample mass

• Consult the periodic table for atomic masses

• Identify the chemical formula

How many hydrogen atoms are present in NH4OH?

• Four

• Five

• Six

• Seven

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

• 16.00 grams per mole

• 1.01 grams per mole

• 14.01 grams per mole

• 12.01 grams per mole

Which element in NH4OH has an atomic mass of 16.00 grams per mole?

• Carbon

• Oxygen

• Nitrogen

• Hydrogen

What is the total molar mass of NH4OH?

• 37.08 grams per mole

• 36.07 grams per mole

• 35.06 grams per mole

• 34.05 grams per mole

What does the molar mass of 35.06 grams per mole signify for NH4OH?

• It is the mass of one atom of NH4OH

• It is the mass of one mole of NH4OH

• It is the mass of one molecule of NH4OH

• It is the mass of one liter of NH4OH