Avogadro's Number
What is the numerical value of Avogadro's number?
6.022 * 1023
What is the mass of 0.25 moles of Methane (CH4)?
4 grams (Molar Mass = 16 g/mol)
What is the standard units used when stating molar mass?
Grams per mole (g/mol)
To convert directly from grams of a substance to its total atoms, what mathematical step must you always go through first?
Converting to moles
On what exact day is Mole Day celebrated every year?
October 23rd!
This is the specific SI unit used to measure the amount of a chemical substance.
The mole
What is the molar mass of Carbon (C)?
12.01 g/mol
What is the mass, in grams, of 1.0 mole of Helium (He)?
4.00 grams
How many atoms are in 24.02 grams of Carbon?
1.204 * 1024 atoms (exactly 2 moles)
Mole Day officially begins at this specific time in the morning.
6:02 AM
How many atoms are contained in exactly 2.0 moles of pure iron?
1.204 * 1024 atoms (or 2 * 6.022 * 1023)
How many moles are in 32.0 grams of Oxygen gas (O2)? (Hint: Oxygen is diatomic!)
1.0 mole (since O2 = 16.0 * 2 = 32.0 g/mol)
What is the mass of 0.50 moles of Sodium Chloride (NaCl)? (Molar mass of NaCl = 58.44 g/mol)
29.22 grams
What is the mass in grams of 6.022 * 1023 molecules of Nitrogen gas (N2)?
28.02 grams (the mass of 1 mole)
Why are the date and time of Mole Day chosen to be 10/23 at 6.02?
To match Avogadro's Number (6.02 * 1023)
What is the volume (in Liters) occupied by one mole of any ideal gas at STP?
22.4 Liters
Convert 40.0 grams of Sodium (Na) into moles.
1.74 moles (40.0 G / 22.99 g/mol)
Calculate the mass of 3.5 moles of pure Copper (Cu).
222.4 grams (3.5 * 63.55)
Calculate the number of molecules in 9.0 grams of water (H2O).
3.011 * 1023 molecules
What furry, underground dwelling animal is widely used as the unofficial mascot for chemistry Mole Day?
A mole!
If you have 3.011 * 1023 molecules of water, how many moles do you have?
0.5 moles
Find the molar mass of water (H2O).
18.02 g/mol (2 * 1.01 + 16.00)
How many grams are in 2.0 moles of Carbon Dioxide (CO2)?
88.02 grams (Molar mass 44.01 * 2)
What is the total mass of 1.50 * 1023 atoms of Gold (Au)?
49.25 grams (0.25 moles * 196.97 g/mol)
Which famous scientist doesn't have his name on the constant 6.022 * 1023 despite it being named after him?
Amedeo Avogadro!