Avogadro's Number
Avogadro's Number
What is 6.022 X 1023
The molar mass of sucrose (C12H22O11)
What is 342.34 g/mol.
The average skittle has a mass of 1.08 g. How many skittles are in a 3.00 pound bag?
1 oz = 28.35 g
1 lb = 16 oz
1260 skittles
The percent of Hydrogen in HCl. (2sf)
What is 2.8%
The molecular formula of a compound with the empirical formula C2OH4 and a molar mass of 88 grams per mole.
What is C4O2H8
The mass of 3.52 X 1024 molecules of water.
105 g
The molar mass of uranium hexafluoride. (UF6)
What is 352.03 g.
Convert 12 miles to inches (no sig figs needed)
760320 inches
The percent of potassium in potassium carbonate. (3sf)
What is 56.6%
K2CO3
Which of these is NOT an empirical formula
A) Mg3(PO4)2
B) C6H12O6
C) SO
B) can reduce to CH2O
The number of atoms in 0.60 moles of Zinc.
3.6 x 1023 atoms
The mass in grams of 8 moles of lead (II) oxide
2000 g
(ONLY 1 SIG FIG) PbO
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The Percent composition each element in HCN (2sf)
What is H: 3.7% C: 44% N: 52%
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
The number of moles in 3.7 X 1025 molecules of carbon dioxide.
What is 61 moles
The number of moles in 13.5 grams of Oxygen gas
0.422 mol
Remember oxygen is O2
This is how many formula units (molecules) are in 100. g of potassium hydroxide.
1.07 x 1024 formula units?
Percent oxygen in aluminum carbonate (4sf)
61.54%
Al2(CO3)3
A lab is performed to find a compound has a mass consisting of 9.03g of Magnesium which combines completely with 3.48 g of Nitrogen. What is the empirical formula?
Mg3N2
The number of hydrogen atoms in 6.0 moles of hydrogen gas.
What is 7.2 X 1024 hydrogen atoms.
This is tricky because there are TWO atoms of hydrogen. Remember H2
A chemist plans to use 435.0 grams of magnesium nitrate in a reaction. How many moles of the compound is this?
2.933 moles
Mg(NO3)2
How many atoms are in 98.5 grams of gold.
3.01x1023 atoms
What percentage of calcium hydroxide is calcium? (3sf)
54.1%
Ca(OH)2
This is the empirical formula for a compound that has 36.0% C, 4.0% H, 28.0% N and 32.0% O.
What is C3H4N2O2?