3. Chemical Reactions
Mass Percent
3. Chemical Reactions
Mass Percent - Video Tutorials & Practice Problems
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Mass Percent is the percentage of a particular element within a compound.
Mass Percent
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Mass Percent Concept
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example
Mass Percent
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Problem
ProblemDetermine the percent composition of nitrogen and oxygen with nitrogen dioxide, NO2.
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PRACTICE PROBLEMS AND ACTIVITIES (90)
- Rubbing alcohol is a 90% (by mass) solution of isopropyl alcohol, C3H8O, in water. How many moles of isopropyl...
- Glycine, an amino acid used by organisms to make proteins, is represented by the following molecular model. ...
- What is the percent composition by mass of Mn in potas-sium permanganate, KMnO4? (LO 3.10) (a) 22.6% (b) 34.8...
- Calculate the percentage by mass of oxygen in the following compounds: (e) dioxin, C12H4Cl4O2
- Calculate the percentage by mass of oxygen in the following compounds: (f) penicillin, C16H18N2O4S.
- Calculate the percentage by mass of oxygen in the following compounds: (c) acetaminophen, C8H9NO2
- Calculate the percentage by mass of oxygen in the following compounds: (b) isopropyl alcohol, C3H8O
- Calculate the percentage by mass of oxygen in the following compounds: (a) vanillin, C8H8O3
- Calculate the percentage by mass of the indicated element in the following compounds: (a) hydrogen in methane,...
- Calculate the percentage by mass of the indicated element in the following compounds: (f) carbon in sucrose, ...
- Calculate the percentage by mass of the indicated element in the following compounds: (e) oxygen in the insec...
- Calculate the percentage by mass of the indicated element in the following compounds: (d) nitrogen in epineph...
- Calculate the percentage by mass of the indicated element in the following compounds: (c) sulphur in magnesium...
- Calculate the percentage by mass of the indicated element in the following compounds: (b) oxygen in vitamin E,...
- Based on the following structural formulas, calculate the percentage of carbon by mass present in each compoun...
- Calculate the percentage of carbon by mass in each of the compounds represented by the following models: (a)
- What is the percent composition of cysteine, one of the 20 amino acids commonly found in proteins? (Gray = C, ...
- (a) Calculate the mass percentage of Na2SO4 in a solution containing 10.6 g of Na2SO4 in 483 g of water.
- A compound whose empirical formula is XF3 consists of 65% F by mass. What is the atomic mass of X?
- The compound XCl4 contains 75.0% Cl by mass. What is the element X?
- Calculate the number of moles of solute present in each of the following aqueous solutions: (c) 124.0 g of a s...
- An aqueous NaCl solution is made using 112 g of NaCl diluted to a total solution volume of 1.00 L. Calculate t...
- An aqueous KNO3 solution is made using 72.5 g of KNO3 diluted to a total solution volume of 2.00 L. Calculate ...
- Silver nitrate solutions are often used to plate silver onto other metals. What is the maximum amount of silve...
- A dioxin-contaminated water source contains 0.085% dioxin by mass. How much dioxin is present in 2.5 L of this...
- A sample that weighs 25.12 g contains 6.022 * 10^23 particles. If 25.00% of the total number of particles are ...
- Lead is a toxic metal that affects the central nervous system. A Pb-contaminated water sample contains 0.0011%...
- Propenoic acid, C3H4O2, is a reactive organic liquid that is used in the manufacturing of plastics, coatings, ...
- Iron metal can be produced from the mineral hematite, Fe2O3, by reaction with carbon. How many kilograms of ir...
- Describe how to prepare each solution from the dry solute and the solvent. c. 125 g of 1.0% NaNO3 solution by ...
- A solution is prepared by dissolving 20.2 mL of methanol (CH3OH) in 100.0 mL of water at 25 °C. The final volu...
- Calculate the mass percent composition of carbon in each carbon-containing compound. c. C2H2
- Calculate the mass percent composition of carbon in each carbon-containing compound. d. C2H5Cl
- Calculate the mass percent composition of carbon in each carbon-containing compound. a. CH4
- Calculate the mass percent composition of nitrogen in each nitrogen-containing compound. c. NO2
- Calculate the mass percent composition of nitrogen in each nitrogen-containing compound. a. N2O
- Most fertilizers consist of nitrogen-containing compounds such as NH3, CO(NH2)2, NH4NO3, and (NH4)2SO4. Plants...
- Iron in the earth is in the form of iron ore. Common ores include Fe2O3 (hematite), Fe3O4 (magnetite), and FeC...
- Copper(II) fluoride contains 37.42% F by mass. Calculate the mass of fluorine (in g) in 55.5 g of copper(II) f...
- Silver chloride, often used in silver plating, contains 75.27% Ag by mass. Calculate the mass of silver chlori...
- The iodide ion is a dietary mineral essential to good nutrition. In countries where potassium iodide is added ...
- Li-ion batteries used in automobiles typically use a LiMn2O4 cathode in place of the LiCoO2 cathode found in m...
- Saline solution used in hospital contains 0.9% sodium chloride by mass. Calculate the number of grams of sodiu...
- Urea, a substance commonly used as a fertilizer, has the for-mula CH4N2O. What is its percent composition by m...
- Calculate the mass percent composition of each of the following substances. (b) Acetaminophen, a headache reme...
- Calculate the mass percent composition of each of the following substances. (a) Malachite, a copper-containing...
- Calculate the mass percent composition of each of the following substances. (c) Prussian blue, an ink pigment:...
- Calcium is an essential nutrient in our body. It is important for bone health. Four common calcium-containing ...
- (b) Hemoglobin, the oxygen-carrying protein in red blood cells, has four iron atoms per molecule and contains ...
- A compound, Na2Cr2Ox, where x is unknown, is analyzed and found to contain 39.70% Cr. What is the value of x?
- Water softeners often replace calcium ions in hard water with sodium ions. Since sodium compounds are soluble,...
- When magnesium metal is burned in air (Figure 3.6), two products are produced. One is magnesium oxide, MgO. Th...
- A mixture of FeO and Fe2O3 with a mass of 10.0 g is con-verted to 7.43 g of pure Fe metal. What are the amount...
- A copper wire having a mass of 2.196 g was allowed to react with an excess of sulfur. The excess sulfur was th...
- The nitrogen in sodium nitrate and in ammonium sulfate is available to plants as fertilizer. Which is the more...
- Element X, a member of group 5A, forms two chlorides, XCl3 and XCl5. Reaction of an excess of Cl2 with 8.729 g...
- Determine the chemical formula of each compound and then use it to calculate the mass percent composition of ...
- Determine the chemical formula of each compound and then use it to calculate the mass percent composition of e...
- Determine the chemical formula of each compound and then use it to calculate the mass percent composition of ...
- Pure gold is usually too soft for jewelry, so it is often alloyed with other metals. How many gold atoms are i...
- The karat scale used to describe gold alloys is based on mass percentages. (b) If an alloy is formed that is 5...
- The karat scale used to describe gold alloys is based on mass percentages. (a) If an alloy is formed that is 5...
- Determine the chemical formula of each compound and then use it to calculate the mass percent composition of ...
- A metal (M) forms a compound with the formula MCl3. If the compound contains 65.57% Cl by mass, what is the id...
- A metal (M) forms an oxide with the formula M2O. If the oxide contains 16.99% O by mass, what is the identity ...
- A phosphorus compound that contains 34.00% phosphorus by mass has the formula X3P2. Identify the element X.
- A particular brand of beef jerky contains 0.0552% sodium nitrite by mass and is sold in an 8.00-oz bag. What m...
- Phosphorus is obtained primarily from ores containing calcium phosphate. If a particular ore contains 57.8% ca...
- The mass percent of an element in a compound is the mass of the element (total mass of the element's atoms in ...
- A compound whose empirical formula is XF3 consists of 65% F by mass. What is the atomic mass of X?
- What is the mass % of carbon in dimethylsulfoxide (C2H6SO) rounded to three significant figures?
- Calculate the percentage by mass of lead in Pb(NO3)2.
- Calculate the mass percent composition of lithium in Li3PO4.
- What is the percentage of nitrogen, by mass, in calcium nitrate?
- What is the percent composition for carbon and hydrogen in ethane C2H6?
- We dissolve 2.45 g of sugar in 200.0 g water. what is the mass percent of sugar in the solution?
- A 500 gram iron ore sample was determined to contain 242 grams of iron. What is the mass percent of iron in th...
- What mass of a 4.00% NaOH solution by mass contains 15.0 g of NaOH?
- A 69.5 g sample of the compound X3O4 contains 19.2 g of oxygen atoms. What is the molar mass of element X?
- Calculate the percent composition by mass of each element in Al(OH)3. Use at least three significant figures.
- Aspirin is a compound with the molecular formula C9H8O4. What is its percent composition?
- Calculate the mass percent composition of nitrogen in each of the following nitrogen compounds.
- Calculate the experimental mass % of c and h in the unknown liquid used in the experiment.
- What is the percent composition of Mg in the compound Mg3(PO4)2?
- What is the percent by mass of chlorine in NaCl? Use mc002-1.jpg. 35.45% 39.34% 60.66% 70.90%
- What is the mass percentage of C in CH3CH3? Provide an answer to two decimal places.
- An oxide of iron has the formula Fe3O4. What mass percent of iron does it contain
- What is the mass percentage of c in caffeine, C8H10N4O2? Provide an answer to two decimal places.
- What is the alcohol content of a 20-oz beer that contains 5% alcohol?
- Which element is in the greatest amount in what is referred to as a starter fertilizer?