Chem So Far Part 2.
A) Name the following compounds:
CaCl2
KClO3
Na2SO4
NF3
P2Cl10
CO
Fe3(PO4)2
Provide chemical formulas from the following names:
Barium Phosphide
Cobalt (III) Bromide
Lithium Phosphite
Radium Carbonate
Copper (II) Hydroxide
Potassium Oxide
Carbon Trioxide
Dinitrogen Pentachloride
Xenon Hexafluoride
B) Molar mass& the mole: The molar mass of any ONE particular element is found off the
periodic table. Carbon has a molar mass of 12.01g/mol, Iron has a molar mass of
55.85g/mol and so on. When finding the molar mass of a compound, you must take into
account how many of each element are present in the chemical formula.
The molar mass of Mn3(PO4)2 is as follows
Determine the molar mass of the following
Ca(NO3)2
Using the molar mass above, we can determine how many formula units are in 400g of
Ca(NO3)2
C) %Composition:
There is a laptop sale at the Apple store. Usually, iPads are $500. The sale calls for 15% off
the original price. How much does the iPad now cost? How much money did you save?
Find the percent composition of each element in the following:
Fe3(PO3)2
Mg(NO2)2
D) Empirical Formula & Hydrates
A sample contains 56.58% of Potassium, 8.68% Carbon, & 34.73% Oxygen. What is the
empirical formula of this compound?
A 6.00g sample of calcium sulfate hydrate (CaSO4.x H2O) is heated until all the water is driven
off. The anhydrous compound has a mass of 4.77 g.
For the data in problem number 1 above, what is the mass percent water in the hydrate?
(mass water/mass total)
Suppose you had an 8.00 g sample of CaSO4.x H2O. How many grams of water would be
present?