The Mole Concept Quiz

Chemists use the mole in order to know the number of___________ in a substance.

I. ions

II. atoms

III. formula units

• I only

• II only

• II and III only

• I, II and III

One mole of a pure substance_________.

• contains 1.2 × 10²³ molecules

• has a mass called atomic mass

• has Avogadro’s number of particles

• contains twice the number of particles as 12 g of carbon-12

The molar mass of ammonium nitrate, NH₄NO₃ , is ___________ g/mol. (H = 1, N = 14, O = 16)

• 80

• 66

• 48

• 34

What is the mass of 3.0 moles of H₂S? (H = 1, S = 32)

• 3.0 g

• 32 g

• 34 g

• 102 g

A 3.0 moles sample of NH₃ contains ________ hydrogen atoms.

• 1.2 × 10²³

• 1.2 × 10²⁴

• 5.4 × 10²⁴

• 9.0 × 10²⁴

How many moles are there in 88 g of CO₂ ? ( C = 12, O = 16)

• 0.50 moles

• 2.0 moles

• 4.0 moles

• 8.8 moles

The molar mass has a unit of _____.

• mol/g

• g/mol

• mol/L

• L/mol

How many molecules are there in 0.50 mol of CH₃OH?

• 8.3 × 10²¹

• 5.0 × 10²²

• 3.0 × 10²³

• 3.0 × 10²⁴

The representative particles in a sample

nitrogen gas, N₂, are _________.

• ion

• atom

• molecule

• formula units

Calculate the number of moles for 4.8 × 10⁸ formula units of NaCl

• 4.8 x 10²⁴

• 8.0 x 10¹⁶

• 8.0 x 10^-16

• 2.88 x 10³²