Assessment - Mole, Mass, Volume & # of Atoms/Molecules/Particles

What is the mass, in grams, of 4.725 mole of aluminum oxide Al₂O₃?{Al = 27, O = 16}

• 964 g

• 482 g

• 1928 g

How many moles of iron (III) oxide are contained in 276 g of pure Fe₂O₃? {Fe = 56, O = 16}

• 0.57 moles

• 1.71 moles

• 3.42 moles

Tags

NGSS.HS-PS1-7

It states that “equal volumes of gases at the same temperature and pressure contain equal numbers of particles”.

• Avogadro's hypothesis

• Newton's hypothesis

• Bohr's hypothesis

At STP, 1 mol, or representative particles, of any gas occupies a volume of......................

• 24.4 L

• 44.2 L

• 22.4 L.

Determine the volume, in liters, of 1.2 mole SO₂ gas at STP.

• 13 L

• 26 L

• 6.5 L

A student wants to convert 7.3 x 10²² molecules of water to moles of water. Which of the following should be the next step in the calculation?

• 6.022 x 10²³ molecules / 1 mol

• 18.01 g / 1 mol

• 1 mol / 6.022 x 10²³ molecules

• 1 mol / 18.01 g

How many atoms are in 0.34 moles of strontium?

• 2.0 x 10²³ atoms of Sr

• 5.7 x 10²³ atoms of Sr

• 1.2 x 10²³ atoms of Sr

• 5.0 x 10²² atoms of Sr

How many molecules of dinitrogen pentoxide are in 1.44 moles of dinitrogen pentoxide (N₂O₅)?

• 3.56 x 10^-24 molecules N₂O₅

• 2.39 x 10^-24 molecules N₂O₅

• 8.67 x 10²³ molecules N₂O₅

• 4.23 x 10²³ molecules N₂O₅

Convert 3.55 grams potassium to atoms. (Molar Mass K = 39.10 g/mol)

• 2.67 x 10²² atoms K

• 5.47 x 10²² atoms K

• 8.36 x 10²⁵ atoms K

• 1.51 x 10^-25 atoms K

Convert 6.7 grams of aluminum sulfate (Al₂(SO₄)₃) to moles. (Molar Mass Al₂(SO₄)₃ = 342.15 g/mol)

• 0.020 mol Al₂(SO₄)₃

• 2.3 x 10³ mol Al₂(SO₄)₃

• 0.039 mol Al₂(SO₄)₃

• 4.0 x 10³ mol Al₂(SO₄)₃