Empircial/Molecular Formulas
Write the empirical formula for the following compounds...
a) C8H18
b) C2H6O2
c) C6H6
a) C4H9
b) CH3O
c) CH
ANSWER = 69.1 grams
How many daughters does Mrs. Walters have?
a) one
b) two
c) three
d) four
ANSWER = c) three
Write the element of the following electron configuration:
1s2 2s2 2p6 3s1
ANSWER = Sodium (Na)
Write the balanced equation for the reaction of acetic acid with the aluminum hydroxide to form water and aluminum acetate...
ANSWER = 3C2H3O2H + Al(OH)3 -> Al(C2H3O2)3 + 3H2O
Find the empirical formula of 63.52 % iron and 36.48% sulfur...
Empirical formula = FeS
What is the concentration of an aqueous solution with a volume of 450 mL that contains 200 grams of iron (II) chloride?
ANSWER = 3.51 M
Why did Mrs.Walters choose to major in chemistry?
a) she was pressured into it
b) her dad was a chemist
c) she loved it in high school and the way it was taught
d) she wanted to be an analytical chemist
ANSWE = c) she loved it in high school and the way it was taught !!
Write the element of the follwoing electron configuration:
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d6
ANSWER = Ruthenium (Ru)
Write the balanced equation for silver nitrate reacting with barium chloride to form silver chloride and barium nitrate...
ANSWER = 2AgNO3 + BaCl2 -> 2AgCl + Ba(NO3)2
A compound with an empirical formula of CFBrO and a molar mass of 253.8 grams per mole. What is the molecular formula of this compound?
Molecular Formula = C2F2Br2O2
How many liters of a 3.4 M isopropanol solution can be made with 78 grams of isopropanol (C3H8O)?
ANSWER = 0.41 L
What state was Mrs. Walters born in?
a) Michigan
b) Missouri
c) Maine
d) Maryland
ANSWER = b) Missouri !!
Write the electron configurations of the following element:
Potassium
ANSWER = [Ar] 4s¹ OR 1s2 2s2 2p6 3s2 3p6 4s1
Using the following equation:
N2(g) + 3H2(g) -> 2NH3(g)
Solve how many liters of nitrogen trihydride is produced at STP if 80.28 grams of hydrogen gas are reacted in an excess of nitrogen?
ANSWERS = 594.7 L NH3
A well-known reagent in analytical chemistry, dimethylglyoxime, has the empirical formula C2H4NO. If its molar mass is 116.1 g/mol, what is the molecular formula of the compound?
Molecular Formula = C4H8N2O2
How many grams of ammonium sulfate is needed to make a 0.25 M solution at a concentration of 6 M?
ANSWER = 171.2 grams
Where did Mrs. Walters attend for her undergrad and grad?
a) Northern Michigan & UW-Madison
b) Northwestern Michigan & UW-Madison
c) U-Mich Ann Anbor & UW-Madison
d) Michigan State & UW-Madison
ANSWER = a) Northern Michigan & UW-Madison !!
Write the electron configuration of the following element:
Magnesisum
ANSWER = [Ne] 3s2 OR 1s2 2s2 2p6 3s2
Using the following equation:
2C8H18(l) + 25O2(g) -> 16CO2(g) + 18H2O(g)
How many moles of oxygen are needed to fully react 837.4 grams of C8H18?
ANSWER = 91.63 moles of O2
Rubbing alcohol was found to contain 60.0 % carbon, and 13.4 % hydrogen, and the remaining mass was due to oxygen. What is the empirical formula for rubbing alcohol?
Empirical Formula = C3H8O
What is the concentration of a solution with a volume of 660 mL that contains 33.4 grams of aluminum acetate?
ANSWER = 0.25 M
What year did Mrs.Walters win homecoming queen?
a) 1985
b) 1988
c) 1991
d) 1995
ANSWER = a) 1985
Write the electron configuration of the following element:
Iridium
ANSWER = [Xe] 6s2 4f14 5d7
Calculate the number of moles of NaOH that are needed to react with 500.0 g of H2SO4 according to the following equation:
H2SO4 + 2 NaOH -> Na2SO4 + 2 H2O
ANSWER = 10.19 mol