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Diatomic Elements
• There
are 7 elements that
naturally come in pairs (2)
instead of by themselves
due to stability.
• Ex. N2 or Cl2
BrINClHOF
Got it? (CFU)
• What
is the molar mass of chlorine?
• What
is the molar mass of carbon?
• What
is the molar mass of oxygen?
• What
is the molar mass of aluminum?
Mole Conversions
1 Mole = 6.022x1023 Particles
(atoms or molecules)
1 Mole = Molar Mass Grams
1 Mole = 22.4 L
(of gas @ STP)
Why does 1 Mole = 22.4 L?
Avogadro’s law states that 1 mole of
any gas will occupy the same volume
as 1 mole of any other gas at the same
temperature and pressure.
At STP, that volume is 22.4 L.
Back to Mole Conversions!
1. How many atoms are in a 0.250 mole sample of
the element silver?
2. How many moles are equal to 100.0 grams of
carbon tetrachloride?
3. What volume of carbon dioxide gas at STP is
required to have 74.6 moles of gas?
4. What mass would 9.8 moles of bromine gas have?
5. How many moles is 3.3x1023 molecules of N2I6?
2 Step Mole Conversions
1.
How many iron atoms are in a 2.75g sample?
2.
A container of what volume is required to hold
12g of chlorine gas at STP?
3.
How many carbon dioxide molecules could be
held in an empty 2.0 L bottle at STP?
4.
What mass of calcium nitrate is equal to
8.4x1026 particles?
Chemistry
January 15th
Pick Up
Warm Up
•What
Turn In
•Mini
Mole Lab
•Conversions #2
is the percent
composition of aluminum
in Al2(CrO4)3?
•What volume of methane
(CH4) gas at STP is
occupied by 5.5 grams?