BASIC CP STOICHIOMETRY TEST
Name: _________________________
Show ALL work (step-by-step) to receive credit for answers.
No Work = No Credit!
Remember significant figures, units and chemical formulas.
Molar Mass: Determine the correct chemical formula and molar mass for each
compound.
1. Lithium nitride
2. Tetraphosphorus decasulfide
3. Niobium (V) peroxide
Determine the percent composition of the indicated element in the following
compounds. Show ALL work (step-by-step) to receive full credit for your correct
answers.
4. Hydrogen in NanoPutian. NanoPutians are a series of organic molecules
whose structural formulae resemble human forms. This example is formally
named 2-(2,5-Bis(3,3-dimethylbut-1-yn-1-yl)-4-{[3,5-di(pent-1-yn-1yl)phenyl]ethynyl}phenyl)-1,3-dioxolane and has the formula C39H42O2.
"NanoPutian" is a portmanteau (blended word) of nanometer, a unit of length commonly used to measure
chemical compounds, and “lilliputian”, a fictional race of humans in the novel Gulliver's Travels by Jonathan
Swift.
5. Silver in HIOAg, a fictitious compound described as the Lone Ranger’s
favorite molecule. The Lone Ranger rode a horse named Silver and his
catch-phrase was “Hi-O-Silver…Away!”
Molar Conversions: Show ALL work (step-by-step).
6. Aspartame is an artificial sweetener that is 160 times sweeter than sucrose
(table sugar) when dissolved in water. It is
marketed as NutraSweet. The molecular
formula of aspartameis C14H18N2O5.
a. Calculate the molar mass of aspartame.
b. How many moles of aspartame are present in a 10.50 gram sample of
aspartame?
c. What is the mass in grams of 1.047 x 10 9 molecules of aspartame?
Empirical and Molecular Formulas. Show ALL work (step-by-step).
7. Tetrodotoxin is a toxic chemical found in fugu
pufferfish, a popular but rare delicacy in Japan. This
compound has an LD50 (the amount of substance that
is lethal to 50% of the population) of 10 µg/kg of body
mass. There is no known cure for this toxin!
Tetrodotoxin is 41.38% carbon, 13.16% nitrogen,
5.37% hydrogen, with the remaining amount consisting of oxygen. What is
the empirical formula of tetrodotoxin?
Element Symbol
Mass
Atomic Mass
Moles
Ratio
8. The molar mass of tetrodotoxin was experimentally determined to be
340.47 g/mol. What is the molecular formula of tetrodotoxin?