A compound with an empirical formula of C2OH4and a molar mass of 88g/mol.
What is the molecular formula of the compound?
Write the empirical formula for the following compounds.
1) C6H6
2) C8H18
3) WO2
4) C2H6O2
5) The empirical formula for Vitamin C is C5H4O3 and its molar mass is 176.17
g/mol. Find the molecular formula
6) A compound with an empirical formula of C2OH4 and a molar mass of 88 grams
per mole. What is the molecular formula of this compound?
7) A compound with an empirical formula of C4H4O and a molar mass of 136
grams per mole. What is the molecular formula of this compound?
8) A compound with an empirical formula of CFBrO and a molar mass of 254.7
grams per mole. What is the molecular formula of this compound?
9) A compound with an empirical formula of C2H8N and a molar mass of 46 grams
per mole. What is the molecular formula of this compound?
11) Nitrogen and oxygen combine to form a compound that is 36.84% N. What is
the empirical formula.
12) A sample of indium chloride weighing 0.5000 g is found to contain 0.2404 g of
chlorine. What is the empirical formula of the indium compound?
Summary:
You will always need to find the empirical formula to be able to find the
molecular formula. Find the empirical formula first and then use the molar
mass to calculate the ratio of the empirical formula to the molecular formula
and multiply by the factor. Don’t forget that you are starting with experimental
data so rounding to whole numbers should be a part of your work.
13) An unknown compound was found to have a percent composition as follows:
47.0 % potassium, 14.5 % carbon, and 38.5 % oxygen. What is its empirical
formula? If the true molar mass of the compound is 166.22 g/mol, what is its
molecular formula?
14) Rubbing alcohol was found to contain 60.0 % carbon, 13.4 % hydrogen, and
the remaining mass was due to oxygen. What is the empirical formula of rubbing
alcohol?
.An unknown compound is found to be 52.94% aluminum and 47.06% oxygen.
What is the empirical formula?
B.An unknown compound is found to be 82.25% nitrogen and 17.75% hydrogen.
What is the empirical formula?
C.Baking soda is found to be 57.13% oxygen, 27.38% sodium, 14.29% carbon, and
1.20% hydrogen. What is the empirical formula?
D.An unknown gas is found to be 57.12% oxygen and 42.88% carbon. What is the
empirical formula?
E.An unknown compound is found to be 92.20% chlorine and 7.80% carbon.
What is the empirical formula?
F.An amethyst geode is found to be 46.76% silicon and 53.24% oxygen. What is
the empirical formula?
G.An unknown toxic compound is found to be 75.73% arsenic and 24.27%
oxygen. What is the empirical formula?
H.An unknown solid found near a volcano is found to be 49.92% oxygen and
50.08% sulfur. What is the empirical formula?
I.An unknown gas is found to be 27.93% phosphorus and 72.07% oxygen. What is
the empirical formula?
J.An extremely poisonous gas is found to be 51.84% nitrogen, 44.44% carbon and
3.73% hydrogen. What is the empirical formula?
K.Laughing Gas is found to be 63.65% nitrogen and 36.35% oxygen. What is the
empirical formula?
L. A toxic compound is found to be71.17% selenium and 28.83% oxygen. What is
the empirical formula?
An unknown gas is made up of 2.67 grams of carbon and 7.11 grams of oxygen.
What is the empirical formula?
N.An unknown compound is made up of 3.2 grams of oxygen and 2.8 grams of
nitrogen. What is the empirical formula?
O.An unknown compound is found to have 5.3 grams of oxygen and 3.6 grams of
sulfur. What is the empirical formula?
P.A sample of silver ore is found to have 14.5 grams of silver and 2.2 grams of
sulfur. What is the empirical formula?
Q.A sample of tin ore is found to have 9.13 grams of tin and 2.46 grams of
oxygen. What is the empirical formula?
R.A sample of copper ore is found to have 41.9 grams of copper and 10.7 grams
of sulfur. What is the empirical formula?
S.A sample of pyrite is found to have 18.6 grams of iron and 21.4 grams of sulfur.
What is the empirical formula?Empirical and Molecular Formula Calculations:
T.A Sample of a gas was found to be 30.45% nitrogen and 69.55% oxygen. That is
the empirical formula? The molarmass of the gas was found to be 92.02 g/mol.
What is the molecular formula?
U.A molecular solid compound was analyzed and found to contain 32.63%
phosphorus and 67.37% oxygen. What is the empirical formula? Later, the molar
mass of the solid was found to be 190 g/mol. What is the molecular formula?