Mole Concept #1

Which statement best describes a mole?

• A mole represents the quantity of a substance that contains 6.0 x 10²² particles

• A mole is the amount of substance that contains Avogadro's number of particles of that substance.

• A mole is the quantity of particles that contains as many particles as there are nitrogen atoms in 14g of Nitrogen.

• A mole is a quantity of measurement for molecular compounds only.

The unit for molar mass is

Sarah is asked to measured 19g of Calcium carbonate in a volumetric flask. What number of moles of CaCO₃ is this equal to if the molar mass of CaCO₃ is 100.01g/mol?

• 0.18mols CaCO₃

• 1.90mols CaCO₃

• 0.19 mols CaCO₃

• 18.99 CaCO₃

Danae is baking a cake which calls for 5.0g of Sodium bicarbonate, popularly called baking soda. The molar mass for this compound is 84.01g/mol. What number of mols of sodium bicarbonate will Danae end up using in her cake if she uses the 5g from the recipe.

• 0.06 mols

• 0.05mols

• 0.03 mols

• 0.04mols

What is the mass of 0.59 moles of ethanoic acid if the compound has a molar mass of 60.05g/mol?

• 101.7g ethanoic acid

• 33.5g ethanoic acid

• 35.4g ethanoic acid

• 101.7g ethanoic acid

What is the number of hydrogen atoms are present in one mole of H₂?

• 6.0 x 10²³

• 1.2 x 10²⁴

• 2.8 x 10²³

• 2.4 x 10²⁴

Calculate the number of moles in 20g of neon. Neon has a molar mass of 20.18g/mol

• 1.25 mols

• 4.36 mols

• 1.02 mols

• 0.99 mols

What does relative in "Relative Molecular Mass" means?

The percentage composition of ALL the elements in a compound must add up to what percentage?

• 50%

• 100%

• 99%

• 1%

Which statement BEST describes percentage composition?

• The proportion of each element by mass that makes up the compound

• The number of molecules that are present in one mole of the compound

• The overall mass of the compound

• The number of atom of each element in the compound