ALEKS 360 AC INTRD CHEM >I<
5th Edition
ISBN: 9781260977585
Author: BAUER
Publisher: MCG
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Textbook Question
Chapter 4, Problem 64QP
Why do we normally use an empirical formula instead of percent composition to represent the composition of a substance?
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you are to determine the molecular formula for a molecular compound consisting of only carbon & hydrogen. The molar mass of this compound is 42.08 g/mol.
Part D:
The empirical formula has a molar mass of 14.026 g/mol (this is called the empirical molar mass). Divide the molar mass for the total compound given above by the empirical formula molar mass.
This will give you a number for multiplying the carbon atoms and hydrogen atoms in the empirical formula.
What is the multiplication value?
The empirical formula of a compound is X5Y7Q by mass and the molecular formula weighs 162.1 g/mol.
1. Suppose the masses of sucrose, sulphur, and magnesium sulphate provided in the table represent the mass of a level teaspoon of the substance,
which sample contained the greatest number of moles of substance?
compound
mass
molar mass
moles of substance
moles of each element
atoms of each element
sodium chloride (NaCl)
5.690 g
58.435 g/mol
0.0973 mol
Na = 0.0973 mole
Na=5.8574 x1022 atoms
Cl = 0.0973 mole
Cl=5.8574 x1022 atoms
water (H2O)
4.930 g
18.014 g/mol
0.2736 mol
H = 0.5472 mole
H= 3.2941 x1023 atoms
O = 0.2736 mole
O= 1.6470 x1023 atoms
sucrose (C12H22O11)
4.000 g
342.251 g/mol
0.0116 mol
C = 0.1392 mole
C= 8.3798 x1022 atoms
H = 0.2552 mole
H= 1.5363 x1023 atoms
O = 0.1276 mole
O= 7.6815 x1022 atoms
sulphur (S)
3.200 g
32.059 g/mol
0.0998 mol
S = 0.0998 mole
S= 6.0079 x1022 atoms
magnesium sulphate (MgSO4)
3.300 g
120.359 g/mol
0.0274 mol
Mg = 0.0274…
Chapter 4 Solutions
ALEKS 360 AC INTRD CHEM >I<
Ch. 4 - Prob. 1QCCh. 4 - Prob. 2QCCh. 4 - Prob. 3QCCh. 4 - Prob. 4QCCh. 4 - Prob. 1PPCh. 4 - Prob. 2PPCh. 4 - Prob. 3PPCh. 4 - Prob. 4PPCh. 4 - Prob. 5PPCh. 4 - Prob. 6PP
Ch. 4 - Prob. 7PPCh. 4 - Prob. 8PPCh. 4 - Prob. 9PPCh. 4 - Prob. 10PPCh. 4 - Prob. 11PPCh. 4 - Prob. 12PPCh. 4 - Prob. 13PPCh. 4 - Prob. 14PPCh. 4 - Prob. 15PPCh. 4 - Prob. 16PPCh. 4 - Prob. 17PPCh. 4 - Prob. 18PPCh. 4 - Prob. 19PPCh. 4 - Prob. 20PPCh. 4 - Prob. 21PPCh. 4 - Prob. 22PPCh. 4 - Prob. 23PPCh. 4 - Prob. 1QPCh. 4 - Prob. 2QPCh. 4 - Prob. 3QPCh. 4 - Prob. 4QPCh. 4 - Prob. 5QPCh. 4 - Prob. 6QPCh. 4 - Lithium carbonate, Li2CO3 , contains 18.8 lithium...Ch. 4 - Prob. 8QPCh. 4 - Prob. 9QPCh. 4 - Prob. 10QPCh. 4 - Prob. 11QPCh. 4 - Prob. 12QPCh. 4 - Prob. 13QPCh. 4 - Prob. 14QPCh. 4 - Prob. 15QPCh. 4 - Prob. 16QPCh. 4 - Prob. 17QPCh. 4 - Prob. 18QPCh. 4 - Prob. 19QPCh. 4 - Prob. 20QPCh. 4 - Prob. 21QPCh. 4 - Prob. 22QPCh. 4 - Prob. 23QPCh. 4 - Prob. 24QPCh. 4 - Prob. 25QPCh. 4 - Prob. 26QPCh. 4 - Prob. 27QPCh. 4 - Calculate the molar mass of each of the following...Ch. 4 - Prob. 29QPCh. 4 - Prob. 30QPCh. 4 - Prob. 31QPCh. 4 - Prob. 32QPCh. 4 - Prob. 33QPCh. 4 - Prob. 34QPCh. 4 - Prob. 35QPCh. 4 - Prob. 36QPCh. 4 - Prob. 37QPCh. 4 - Prob. 38QPCh. 4 - Prob. 39QPCh. 4 - Prob. 40QPCh. 4 - Prob. 41QPCh. 4 - Prob. 42QPCh. 4 - Prob. 43QPCh. 4 - Calculate the mass of 0.750 mol of the following...Ch. 4 - Prob. 45QPCh. 4 - Prob. 46QPCh. 4 - A sample of ammonia, NH3 , weights 30.0 g....Ch. 4 - Prob. 48QPCh. 4 - Which of these substance has the most atoms per...Ch. 4 - Which of these substances has the atoms per mole?...Ch. 4 - A raindrop weighs 0.050 g. How many molecules of...Ch. 4 - A gain of sand weighs 7.7104g . How many formula...Ch. 4 - How many formula units are in 250.0 g of the...Ch. 4 - How many formula units are in 375.0 g of the...Ch. 4 - How many atoms (or ions) of each element are in...Ch. 4 - How many atoms (or ions) of each element are in...Ch. 4 - What is the mass of 6.41022 molecules of SO2?Ch. 4 - What is the mass of 1.81021 molecules of H2SO4?Ch. 4 - Which compound, NH3,NH4Cl,NO2,orN203, contains the...Ch. 4 - Which compound, NaCl,PC13,CaC12,orHCIO2, contains...Ch. 4 - You have two colorless gases, each made of sulfur...Ch. 4 - Describe some uses for the percent composition of...Ch. 4 - What is the difference between an empirical...Ch. 4 - Why do we normally use an empirical formula...Ch. 4 - Which of the following molecules have an empirical...Ch. 4 - Which of the following substances have an...Ch. 4 - Prob. 67QPCh. 4 - What is the empirical formula of each of the...Ch. 4 - Prob. 69QPCh. 4 - Prob. 70QPCh. 4 - Which of the following compounds of nitrogen and...Ch. 4 - Which of the following compounds of carbon and...Ch. 4 - What are the empirical formulas of the compounds...Ch. 4 - What are the empirical formulas of the compounds...Ch. 4 - Eugenol, a chemical substance with the flavor of...Ch. 4 - One of the compounds in cement has the following...Ch. 4 - The explosive trinitrotoluene (TNT) has the...Ch. 4 - Strychnine (rat poison) has the composition...Ch. 4 - An unknown organic compound was determined to have...Ch. 4 - Prob. 80QPCh. 4 - Prob. 81QPCh. 4 - Prob. 82QPCh. 4 - Prob. 83QPCh. 4 - Prob. 84QPCh. 4 - Prob. 85QPCh. 4 - Prob. 86QPCh. 4 - What is the percent composition of each of the...Ch. 4 - Prob. 88QPCh. 4 - Prob. 89QPCh. 4 - Prob. 90QPCh. 4 - Prob. 91QPCh. 4 - Prob. 92QPCh. 4 - Prob. 93QPCh. 4 - Prob. 94QPCh. 4 - Prob. 95QPCh. 4 - Prob. 96QPCh. 4 - Prob. 97QPCh. 4 - Prob. 98QPCh. 4 - Prob. 99QPCh. 4 - Prob. 100QPCh. 4 - Prob. 101QPCh. 4 - Prob. 102QPCh. 4 - Prob. 103QPCh. 4 - Prob. 104QPCh. 4 - Prob. 105QPCh. 4 - Prob. 106QPCh. 4 - Prob. 107QPCh. 4 - Prob. 108QPCh. 4 - Prob. 109QPCh. 4 - Prob. 110QPCh. 4 - Prob. 111QPCh. 4 - Prob. 112QPCh. 4 - Prob. 113QPCh. 4 - Prob. 114QPCh. 4 - Prob. 115QPCh. 4 - Prob. 116QPCh. 4 - Prob. 117QPCh. 4 - How many molecules are present in 15.43 g of butyl...Ch. 4 - Prob. 119QPCh. 4 - Prob. 120QPCh. 4 - Prob. 121QPCh. 4 - Prob. 122QPCh. 4 - Prob. 123QPCh. 4 - Prob. 124QPCh. 4 - Prob. 125QPCh. 4 - Prob. 126QPCh. 4 - Prob. 127QPCh. 4 - Prob. 128QPCh. 4 - Prob. 129QPCh. 4 - Prob. 130QPCh. 4 - Prob. 131QPCh. 4 - Prob. 132QPCh. 4 - Prob. 133QPCh. 4 - Prob. 134QPCh. 4 - Prob. 135QPCh. 4 - Prob. 136QPCh. 4 - Prob. 137QPCh. 4 - Prob. 138QPCh. 4 - Prob. 139QPCh. 4 - Prob. 140QPCh. 4 - Prob. 141QPCh. 4 - Prob. 142QPCh. 4 - Prob. 143QPCh. 4 - Prob. 144QPCh. 4 - Prob. 145QPCh. 4 - Prob. 146QPCh. 4 - Prob. 147QPCh. 4 - Prob. 148QPCh. 4 - Prob. 149QPCh. 4 - Prob. 150QPCh. 4 - Prob. 151QPCh. 4 - Prob. 152QP
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