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# 6.3 Using Chemical Formulas

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## Katelynn Dorn

on 10 November 2016

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#### Transcript of 6.3 Using Chemical Formulas

Formula Mass is the sum of the average atomic masses of a compound's elements.
What is the average mass of one water molecule?
2 H atoms x 1.01 u = 2.02 u
1 O atom x 16 u = 16.00 u
2.02 u + 16.00 u = 18.02 u for H2O
The Molar Mass of a compound is numerically equal to its formula mass
In H2O we have two moles of hydrogen and one mole of oxygen
What is the molar mass of one water molecule?
2 H moles x 1.01 g = 2.02 g
1 O mole x 16 g = 16.00 g
2.02 g + 16.00 g = 18.02 g/mol for H2O
Molar Mass
What is the molar mass of barium nitrate, Ba(NO3)2?
Molar Mass is used to convert from Moles to Grams
amount in moles x molar mass = mass in grams
What is the mass in grams of 2.50 mol of oxygen gas?
Percentage Composition
Find the percentage composition of copper(I) sulfide, Cu2S.
Formula Mass
Find the formula of potassium chlorate, KClO3
Percent Composition is the number of grams in one mole of a compound
You can find out how much one element contributes to the overall makeup of a compound:
mass of element in compound / total mass of compound x 100
6.3 Using Chemical Formulas
Ch. 6 Chemical Formulas and Chemical Compounds
Formula Mass Practice F

1a. 98.09 u
1b. 164.10 u
1c. 94.97 u
1d. 95.21 u
Molar Mass Practice G
1a. 2 mol Al, 3 mol S
1b. 1 mol Na, 1 mol N, 3 mol O
1c. 1 mol Ba, 2 mol O, 2 mol H
2a. 150.17 g/mol
2b. 85.00 g/mol
2c. 171.35 g/mol
Molar Mass as a Conversion Factor Practice
What is the mass in grams of 3.04 mol of ammonia vapor, NH3?

Calculate the mass of 0.257 mol of calcium nitrate, Ca(NO3)2.
51. 8 g

42.2 g
Molar Mass as a Conversion Factor
Ibuprofen, C13H18O2, is the active ingredient in many nonprescription pain relievers. Its molar mass is 206.31 g/mol. If the tablets in a bottle contain a total of 33 g of ibuprofen, how many moles of ibuprofen are in the bottle? How many molecules of ibuprofen are in the bottle? What is the total mass in g of C in 33 g of ibuprofen?
Molar Mass as a Conversion Factor Practice I
1a. 0.0499 mol
1b. 61 mol
2a. 1.53 x 10^23 molecules
2b. 2.20 x 10^23 molecules
3. 1170 g
Calculate the percentage composition of sodium nitrate, NaNO3

Calculate the percentage composition of silver sulfate, Ag2SO4
Percentage Composition Practice
27.05% Na, 16.48% N, 56.47% O

69.19% Ag, 10.28% S, 20.52% O
Percentage Composition K
As some salts crystallize from a water solution, they bind water molecules in their crystal structure. Sodium carbonate forms such a hydride, in which 10 water molecules are present for every formula unit of sodium carbonate. Find the mass percentage of water in sodium carbonate decahydrate, Na2CO3x10H2O, which has a molar mass of 286.19 g/mol.
Percentage Composition Practice K
1a. 74.51% Pb, 25.49% Cl
1b. 52.55% Ba, 10.72% N, 36.73% O
2. 46% H2O
3. 96.0 g O, 6.00 mol O
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