Water Molecule Mass and Properties

The video tutorial explains how to find the mass of a single water molecule. It begins by calculating the molar mass of water, which involves adding the atomic masses of hydrogen and oxygen. The molar mass is then divided by Avogadro's number to find the mass of one molecule. The tutorial concludes with the final calculation, providing the mass in grams and converting it to kilograms.

What is the first step in finding the mass of a water molecule?

• Count the number of water molecules

• Measure the volume of water

• Determine the density of water

• Calculate the molar mass of water

How many hydrogen atoms are present in a water molecule?

• Three

• Four

• Two

• One

What is the molar mass of water?

• 20.00 g/mol

• 18.02 g/mol

• 22.02 g/mol

• 16.00 g/mol

What is Avogadro's number used for in this calculation?

• To measure the density of water

• To determine the number of particles in a mole

• To convert grams to kilograms

• To find the volume of water

Why do the units of moles cancel out in the calculation?

• Because they are not needed

• Because they are on both the top and bottom of the fraction

• Because they are incorrect

• Because they are in grams

What is the mass of one water molecule in grams?

• 3.99 x 10^-22 grams

• 2.99 x 10^-22 grams

• 3.99 x 10^-23 grams

• 2.99 x 10^-23 grams

How do you convert the mass of a water molecule from grams to kilograms?

• Add 1000

• Multiply by 1000

• Divide by 1000

• Subtract 1000

What is the mass of one water molecule in kilograms?

• 3.99 x 10^-26 kg

• 3.99 x 10^-23 kg

• 2.99 x 10^-26 kg

• 2.99 x 10^-23 kg