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[DOC File]AP Chemistry – Chapters 1 and 2
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Elemental analysis of an unknown pure substance indicated that the percent composition by mass is as follows. Element Percent by Mass Carbon 49.02% Hydrogen 2.743% Chlorine 48.23% A solution that is prepared by dissolving 3.150 grams of the substance in 25.00 …
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[DOC File]Percent Composition and Empirical Formula
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The percent composition gives the percent by mass of each element in the compound and is the simplest way experimentally to describe the composition of a substance. According to the law of definite proportions, which was first formulated in the early 1800s by Joseph Proust, the elements in a given compound are always present in the same ...
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[DOC File]Molar Mass Percent Composition
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Percent Composition Worksheet . Calculate the percentage composition of each of the following compounds. Show your work and always include units (Show the answer from calculator first, then round the answers to 2 decimal places). 1. Ca3P2 (66.0% Ca, 34.0% P) % Ca = 120.24 x 100% % P = 61.94_ x 100% . 182.15 182.15
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[DOC File]Lab: The Atomic Mass of Candium - LPS Puma Chemistry
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Aug 09, 2012 · 1. Calculate the average mass for each isotope (answers in row 3) Average Mass = total mass of atoms . total number of atoms. 2. Calculate the percent abundance of each isotope (answers in row 4) % Abundance = number of particles of isotope x 100 . total number of particles. 3. Calculate the average atomic mass of this element, Candium.
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[DOC File]Percent Composition Worksheet
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Percent Composition Worksheet. Calculate the molar mass for the following compounds. SiF4 KOH. Calculate the percent composition of carbon for the following compounds. CaCO3 CH4. Sn(CO3)2. Calculate the percent composition of nitrogen for the following compounds. N2O. Sr(NO3)2. NH4NO3. Calculate the percent composition for each element in ...
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[DOC File]Molar Mass Percent Composition
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Chemistry: Molar Mass and Percentage Composition KEY. Calculate the molar masses and percentage composition of each of the following compounds. Show your work and always include units. 1. Ca3P2. 2. Ca(OH) 2. 3. Na2SO4. 4. CaSO4. 5. (NH4) 2SO4. 6. Zn3(PO4) 2. 7. Mg(NO2) 2. 8. KCl
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[DOC File]Chapter 13 worksheet #1
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mass fraction = mass of component / total mass of soln. mass % = mass fraction x 100. parts per million/billion/trillion (ppm/ppb/ppt) ppm = (mass fraction) x 106. ppb = (mass fraction) x 109. ppt = (mass fraction) x 1012. Used for very dilute solutions (for example pollutants in drinking water). Notice that mass percent could also be called ...
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[DOC File]Empirical and Molecular Formula Worksheet
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13) An unknown compound was found to have a percent composition as follows: 47.0 % potassium, 14.5 % carbon, and 38.5 % oxygen. What is its empirical formula? If the true molar mass of the compound is 166.22 g/mol, what is its molecular formula? K2C2O4
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[DOC File]SPECTROPHOTMETRIC DETERMINEATION OF THE COPPER …
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The original brass sample in prelab question 5 had a mass of 0.96 g. Calculate the percent copper in this brass sample. MATERIALS PER GROUP. Apparatus Reagents and consumables. 6 cuvets copper(II) sulfate pentahydrate. 2 100 mL volumetric flasks deionized water. …
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Modeling Isotopes – Calculating the Atomic Mass of “Snackium”
Mass number Exact weight (amu) Percent Abundance 12 12.000000 98.90 13 13.003355 1.10 Find the average atomic mass for silicon, and check your answer. Mass number Exact Weight (amu) Percent Abundance 28 27.976927 92.23 29 28.976495 4.67 30 29.973770 3.10 Find the average atomic mass for molybdenum and check your answer.
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Percent by mass calculator