Molar Mass and Chemical Composition

This video tutorial explains how to calculate the molar mass of ammonium dichromate (NH4)2Cr2O7. It begins by identifying the individual atomic masses of nitrogen, hydrogen, chromium, and oxygen. The tutorial then demonstrates how to multiply these atomic masses by their respective quantities in the compound. Finally, it sums these values to find the total molar mass, which is 252.08 grams per mole. The video concludes by explaining the significance of this calculation in terms of moles and mass.

What is the chemical formula for ammonium dichromate?

• NH4Cr2O7

• (NH4)2Cr2O7

• NH3Cr2O7

• (NH3)2Cr2O7

How many hydrogen atoms are present in ammonium dichromate?

• 2

• 4

• 6

• 8

What is the molar mass of nitrogen in ammonium dichromate?

• 14.01 g/mol

• 28.02 g/mol

• 18.05 g/mol

• 36.10 g/mol

What is the molar mass of chromium in ammonium dichromate?

• 32.00 g/mol

• 16.00 g/mol

• 103.98 g/mol

• 51.99 g/mol

How many oxygen atoms are present in ammonium dichromate?

• 5

• 6

• 8

• 7

What is the total molar mass of ammonium dichromate?

• 150.00 g/mol

• 300.00 g/mol

• 200.00 g/mol

• 252.08 g/mol

If you have 252.08 grams of ammonium dichromate, how many moles do you have?

• 3 moles

• 2 moles

• 0.5 moles

• 1 mole

What is the significance of the molar mass in chemistry?

• It shows the solubility of a compound.

• It determines the color of a compound.

• It helps in calculating the number of moles in a given mass.

• It indicates the boiling point of a compound.