Avogadro's number and molar volume

Molar volume of any gas at STP

• 22.4 L
• 2.24 L
• 6.02 x 10²³ L
• 224 L

A 2.00 L sample of pure oxygen gas (O₂) is measured at STP.  How many moles of oxygen is this?

• 24.4 mol
• 0.007 mol
• 1.44 mol
• 0.09 mol

Tags

NGSS.HS-PS1-7

A sample of carbon dioxide at STP is 0.50 L.  How many grams of carbon dioxide do we have?

• 0.48 g
• 0.49 g
• 1.96 g
• 0.98 g

Tags

NGSS.HS-PS1-7

How many moles are in 225 g of CO?

• 28.01 mol

• 4.82 x 10²⁴ mol

• 6,302,25 mol

• 8.0357 mol

What is the formula to calculate the number of moles of a compound?

• Moles = mass/concentration

• Moles = molar mass/mass of sample

• Moles = mass/Mr

• Moles = distance/time

What is Avogadro's constant?

• 6.02 X 10²³

• 6.02 X 10²²

• 6.02 X 10³²

• 6.02

In chemistry, a "mole" is:

• The mass of an atom
• A unit of measurement to count particles
• based on the volume of a substance
• The number of atoms

The unit for molar mass is

• g/mol
• mol/g
• grams
• moles

Tags

NGSS.HS-PS1-7

What is the total number of molecules in 1.0 mole of CO₂?

• 1.5 x 10²³

• 12 x 10²³

• 3 x 10²³

• 6.02 x 10²³

The total number of sodium atoms in 46.0 grams is

• 3.01 x 10²³
• 6.02 x 10²³
• 12 x 10²³
• 24 x 10²³