Introduction to Moles

What is the SI unit that refers to the number of particles contained in a substance?

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

Which of the following statements regarding the mole is correct?

• A mole is a counting unit equal to 6.02 x 1023 particles.

• The number of particles in a mole is known as Avogadro’s number.

• 1 mole = Avogdro's number

• all of the above

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.

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

• 7.5

• 8.2

• 10.2

• 9.5

Which would have more atoms?

• mole of Li

• mole of Au

• mole of Si

• None, all are equal

How many atoms of iodine are in a mole of iodine?

• 53

• 63.55g

• 126.9

• 6.02 x 10²³

A mole of Neon contains
6.02 x 10²³ _____

• atoms

• formula units

• ions

• molecules