The Mole
% Comp.
Hydrates
Empirical Formulas
Random Review
100
Define Avogadro's number.
What is the number of particles in a mole as defined by 6.02*10^23?
100
Describe the steps in calculating percentage composition.
What is 1)find the total gfm 2)find gfm of each specific element 3)divide the element's gfm by the compund's gfm?
100
Name the following: CuSO4 * 5H2O.
What is Copper II Pentahydrate; Cupric Sulfate Pentahydrate?
100
Explain the difference between empirical and molecular formulas.
What is molecular is the original formula and empirical is the simplified version of molecular?
100
What does STP stand for?
What is Standard Temperature and Pressure?
200
1 mole = ______ molecules, _____ liters, ______ grams
What is 6.02*10^23, 22.4, gfm?
200
Define % composition.
What is the % of the gfm represented by each element?
200
Define hydrate.
What is a crystal consisting of a solid substance combined chemically with H2O in a definite ratio?
200
Explain how to find the empirical formula of a compound.
What is 1)find the # of moles in each element (%=g; convert % to mass; convert mass to moles) 2) determine the whole # ratio by dividing each mole by the smallest mole number 3)use the mole ratio for the subscripts in the formula?
200
How many sig. figs. in the following number: 123456789.001.
What is twelve?
300
Find the percent composition of carbon in carbon dioxide.
What is 27%?
300
Name the following: NiSO3 * 6H2O.
What is Nickel Sulfite Hexahydrate?
300
Determine the empirical formula of a compound that is composed of 36.5% Na, 25.4% S, and 38.1% O.
What is Na2SO3?
300
When is mole day
What is october 23?
400
Describe the steps for naming a hydrate.
What is 1)name the regular compound 2)add the word hydrate 3)use a prefix to indicate the number of H2O molecules?
500
A 3.0 gram sample of a hydrate of a NaSO4 is heated and only 2.5 grams of the anhydrous salt remained. What % of water was in the hydrate?
What is 17%?
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