Honors OLD Chem
Starting Question:
How many kids does Mr. Baughman have?
2
How many moles in 1.2044x1024 atoms of lithium?
2 moles
Carbon
12.01 g/mol
What is the percent oxygen in CO2?
72.71%
The molecular formula of a compound with the empirical formula C2OH4 and a molar mass of 88 grams per mole.
What is C4O2H8
In the simplest whole number balanced equation for aluminum reacting with oxygen in a synthesis reaction, what is the coefficient of aluminum?
4
4Al + 3O2 → 2Al2O3
Calculate the number of moles in 4.5 g sodium chloride
0.077 moles
Aluminum
26.98 g/mol
The Percent composition of carbon in HCN
What is H: 3.74% C: 44.43% N: 51.83%
Which of these is NOT an empirical formula. For the one that is NOT empirical, make it empirical
A) Mg3(PO4)2
B) C6H12O6
C) SO
B) can reduce to CH2O
Which of the following molecules are polar?
CO2 , PF3 , H2 , CH4
PF3
600 points for team in last place.
Next question picked is double points for everyone!
NEW current last place team, pick new category
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oxygen gas
32 g/mol
DOUBLE POINTS:
Percent oxygen in aluminum carbonate AND what is the mass oxygen extracted from 5 grams of aluminum carbonate
61.54% ; 3.077 g
Al2(CO3)3
A compound is found to contain 5.9% Hydrogen and 94.1% Oxygen and a molar mass of 34 g/mol. What are the empirical and molecular formulas of this compound?
HO and H2O2
Pick a different team...
Play rock paper scissors. Best of 3. Winner +400, Loser -400
How many atoms are in 98.5 grams of gold.
3.01x1023 atoms
Iron
55.84
What percentage of calcium hydroxide is calcium AND number of moles of calcium in 4 grams calcium hydroxide?
54.1% ; 0.054 moles
Ca(OH)2
What is the molecular formula for a compound that has 36.0% C, 4.0% H, 28.0% N and 32.0% O and a molar mass of 300 g/mol
Molecular: C9H12N6O6
Empirical was C3H4N2O2
What is the shape of NH3?
Trigonal Pyramidal
This is how many formula units (molecules) are in 100 g of magnesium chloride.
6.33 x 1023 formula units of MgCl2
Water
18.02 g/mol
The percent of potassium in potassium nitrite.
What is 45.94%
KNO2
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