Avogadro

Why is the mole used in chemistry?

• The mass of atoms is in AMUs which is too hard to convert to grams.

• A dozen is not a scientific amount.

• Chemists needed to make chemistry easier to understand.

• It makes counting large numbers of small particles easier.

Avogadro's number of particles in a mole holds true for:

• Ions

• Molecules

• Atoms

• All of these

One contains Avogadro's number of molecules.

• Gram

• Weight

• Mole

• None of these

Avogadro's number is defined as the number of atoms present in one mole of the element or the number of molecules present in one mole of the substance.

• TRUE

• FALSE

Which of the following statements regarding the mole is NOT correct?

• A mole is a counting unit

• Equal to 6.02 x 10²³ particles.

• The concept of mole is similar to the concept of dozen

• none of the above

Tags

NGSS.HS-PS1-7

When comparing a mole of oxygen and a mole of sulfur, how many atoms does each have?

• oxygen has 16 grams of atoms

• sulfur has 32.06 grams of atoms

• both contains 6.02 x 10²³ atoms

• can not be determined

Tags

NGSS.MS-PS1-1

How can you figure out how particles (atoms) there are in 2 moles?

• 2

• 2 x (6.02 x 10²³)

• 2 x (atomic mass)

• 2 ÷ (6.02 x 10²³)

What is Avogadro's number?

Tags

NGSS.HS-PS1-7

Avogadro's number is used to convert between which two units?

• Grams and moles

• Atoms and grams

• Moles and particles

• Liters and moles

Which of the following is a real-world application of Avogadro's number?

• Calculating the number of atoms in a chemical reaction

• Determining the speed of light

• Measuring the gravitational force

• Predicting weather patterns

Tags

NGSS.HS-PS1-5