Moles
What is a "mole" in chemistry?
A "counting unit" in chemistry for counting small stuff
What unit for mass must be used when doing mole to mass conversions?
grams (g)
100 points each!
What 3 terms could the word "particles" represent when doing mole conversions?
atoms
molecules
FUs (formula units)
What unit for volume must be used for all mole to volume conversions?
liters (L)
What do you get when you cut an avocado into 6.02x1023 pieces?
guacamole
200 points each!
Name any scientist (last name ok) involved in creating the concept of the mole in chemistry.
Avagadro
Loschmidt
Millikan
Perrin
1 mole of any pure substance = ___?
It's "molar mass"
It's "atomic mass"
1 mole of any pure substance = ___ particles
6.02 x 1023
1 mole of any gas = ___ L
22.4 L
LAB QUESTION:
A "mole" is a bridge between things we can ___ and things we cannot.
In other words, a "mole" allows us to ___ things we can't see.
(The ___ is the same word in both)
measure
3.01 x 1023 atoms Ag = ___ moles
0.5 moles Ag
23.0 g C = ___ moles
1.92 moles C
6.02 x 1024 FU Al = ___ moles
10.0 moles Al
105 L Ne = ___ moles
4.69 moles Ne
1 x 106 = 1 "million"
1 x 109 = 1 "billion"
Avagadro's number = 602 "___"
(a number with 21 zeros behind it)
36.04 g H2O = ___ moles
2 moles H2O
What is the percent composition (by mass) of oxygen in water?
88-89% oxygen
0.234 moles CO2 = ___ FU
1.41 x 1023 FU CO2
33.3 L Kr = ___ FU
8.95 x 1023 FU Kr
What does the word "mole" mean in Latin?
(what is its literal translation?)
"huge pile"
1 mole of basketballs would occupy roughly the same space as ___
(from a video we watched in class)
Earth
50.0 g Ar (gas) = ___ L
28.0 L Ar
5.5 x 1023 molecules of hydrogen gas (H2) would occupy what volume (L) at STP?
20.5 L H2
What is the mass of 100.0 L of SO2 (sulfur dioxide gas)?
285.6 g SO2
DAILY DOUBLE!
1. What is the empirical formula for a compound containing 26.57% potassium, 35.36% chromium, and 38.07% oxygen?, by mass?
2. What is its name?
K2Cr2O7
potassium dichromate