Moles and Molar Volume

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

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

Standard temperature and pressure (STP) mean

• A temperature of 0°C and a pressure of 101.3 kPa, or 1 atmosphere (atm).

• A temperature of 100°C and a pressure of 101.3 kPa, or 1 atmosphere (atm).

• A temperature of 0°K and a pressure of 10 atmosphere (atm).

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

• 24.4 L

• 44.2 L

• 22.4 L.

The quantity, 22.4 L, is called the ........................ of a gas.

• molar volume

• molar mass

• Atomic volume

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

• 13 L

• 26 L

• 6.5 L

Different gases have different densities

• True

• False

Usually the density of a gas is measured in grams per liter (g/L) and at a specific temperature

• True

• False

The density of a gaseous compound is found to be 0.982 g/L at STP. What is the molar mass of the compound?

• 22

• 44

• 33