Mass percent problems and answers
[DOC File]South Pasadena · AP Chemistry
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Starting with a mixture of 32.0 g of sulfur and 71.0 g of Cl2, which is the limiting reactant? What mass of S2Cl2 (in grams) can be produced? What mass of the excess reactant remains when the limiting reactant is consumed? S8 is LR…..67.3 g of S2Cl2 ia formed. 35.37 g of Cl2 reacted…therefore, 35.6 g remain. Percent Yield. 29.
[DOC File]Percent Composition Worksheet
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Mass of Sample x 100 = Percent Composition. Total mass in the sample. So, in the M&M’s problem: 26 red x 100 = 13%. 200 total. Example 2: Find the percent composition of copper (Cu) in CuBr2. Mass of Cu in the compound x 100 = Percent Composition. Total Mass of CuBr2 Compound. 63.546 grams x 100 = 28.4%. 223.354 grams. Percent Composition ...
[DOC File]Name __________________________________________ Date
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Calculate the mass percent concentration. Here are some combination questions: A solution is prepared by dissolving 50.0 g of cesium chloride in 50.0 g water. The volume of the solution is 63.3 mL. Calculate the molarity, molality, and mole fraction of the solution. An aqueous antifreeze solution is 40.0 % enthylene glycol (C2H6O2) by mass.
[DOC File]Exercises (Mass Percent)
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5. What mass of NaF must be mixed with 25 mL of water to create a 3.5% by mass solution? 6. An 800 g solution of Kool-Aid contains 780 g of water. What is the mass percent of solute in this solution? 7. What is the mass percent of a solution created by adding 10 g of olive oil to 90 g of vegetable oil? 8.
[DOC File]Average Atomic Mass Problems
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Base your answers to questions 7 and 8 on the information below. The accepted values for the atomic mass and percent natural abundance of each naturally occurring isotope of silicon are given in the data table below. Isotopic notation Percent abundance Atomic mass Si-28 92.22 % 27.98amu Si-29 4.69% 28.98amu Si-30 3.09% 29.97amu
[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 ...
PERCENTAGE COMPOSITION WORKSHEET
(a) the percent of sodium (by mass) in the hydrate (b) percent of . TOTAL. oxygen (by mass) in the hydrated compound (c) percent of water (by mass) in the hydrate. 4. Calculate the percentage of nitrogen (by mass) in ammonium nitride. 5. Calculate the number of GRAMS of magnesium in 50.0 g of magnesium sulfide.
[DOC File]Chemistry Midterm Exam Review
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Average Atomic Mass = ([(isotope mass)(percent abundance)] To solve for percent abundance assign the first isotope x and the second isotope equal to 100% - x. There are two naturally occurring isotopes of rubidium: 85Rb, which has a mass of 84.91 amu and 87Rb, which has a mass of 86.92 amu. The atomic mass of rubidium is 85.47 amu.
[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 ...
[DOCX File]Percentage Composition and Empirical & Molecular Formula
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Solve the following problems. Show your work, and always include units where needed. 1. A compound is found to contain 36.5% Na, 25.4% S, and 38.1% O. Find its empirical formula. 2. Find the empirical formula of a compound that is 53.7% iron and 46.3% sulfur. 3. Analysis of a sample of a compound indicates that is has 1.04 g K, 0.70 g Cr, and 0 ...
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