Understanding the Mole Concept and Related Calculations

Why is it challenging to count atoms directly?

• Atoms are too large to count individually.

• Atoms are too small to count individually.

• Atoms are always in motion.

• Atoms are not visible to the naked eye.

What is Avogadro's number?

• 6.02 x 10^24

• 6.02 x 10^23

• 6.02 x 10^22

• 6.02 x 10^25

How many molecules are in one mole of a substance?

• 6.02 x 10^22

• 6.02 x 10^23

• 6.02 x 10^24

• 6.02 x 10^25

If you have 4 moles of sodium chloride, how many molecules do you have?

• 2.41 x 10^21

• 2.41 x 10^22

• 2.41 x 10^23

• 2.41 x 10^24

How many moles are in 3.01 x 10^22 atoms of magnesium?

• 0.05 x 10^-1 moles

• 0.005 moles

• 0.5 moles

• 0.05 moles

How many fluoride ions are in 1.46 moles of aluminum fluoride?

• 2.64 x 10^24

• 2.64 x 10^21

• 2.64 x 10^23

• 2.64 x 10^22

What is the atomic mass of hydrogen?

• 58.44 amu

• 18.0154 amu

• 15.9994 amu

• 1.00794 amu

What is the molecular mass of water?

• 1.00794 amu

• 18.0154 amu

• 58.44 amu

• 15.9994 amu

How is molar mass typically expressed?

• Molecules per mole

• Atoms per mole

• Kilograms per mole

• Grams per mole

What is the molar mass of sodium chloride?

• 18.0154 g/mol

• 58.44 g/mol

• 1.00794 g/mol

• 15.9994 g/mol