Chemistry Chemistry Practice Problems Solutions Library

Mass Percent Solutions Library

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258 solutions

Mass Percent

Q. A 0.45-g sample of aspirin is decomposed into its constituent elements and found to contain 0.27 g C, 0.020 g H, and 0.16 g O.Calculate the mass pe...

Solved • Feb 24, 2021

Mass Percent

Q. At 1700°C, the equilibrium constant, Kc, for the following reaction is 4.10× 10–4.N2(g) + O2(g) ⇌ 2 NO(g)What percentage of O2 will react to form N...

Solved • Feb 24, 2021

Mass Percent

Q. Which compound has the smallest percent composition by mass of chlorine?A) NaClB) HClC) KClD) LiCl

Solved • Feb 1, 2021

Mass Percent

Q. Which compound has the highest percent composition by mass of strontium?A) SrOB) SrI2C) SrCl2D) SrS

Solved • Feb 1, 2021

Mass Percent

Q. Part C. If 51.0 % of the SO2 could be removed by reaction with powdered calcium oxide, CaO, via the reaction SO2(g) + CaO(s) → CaSO3(s)how many ton...

Solved • Jul 1, 2020

Mass Percent

Q. Part B. Assuming that the coal was 2.70 % sulfur by mass and that combustion was complete, calculate the number of tons of sulfur dioxide produced ...

Solved • Jul 1, 2020

Mass Percent

Q. Part A. Assuming that the coal was 82.2 % carbon by mass and that combustion was complete, calculate the number of tons of carbon dioxide produced ...

Solved • Jul 1, 2020

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Q. Part B. What is the mass percentage of ethyl alcohol, C2H5OH, in the solution?Express your answer numerically in percent.An organic liquid is a mix...

Solved • Jul 1, 2020

Mass Percent

Q. How many moles of each element are in this sample?Information for Parts B, C, and DA compound is 80.0% carbon and 20.0% hydrogen by mass. Assume a ...

Solved • Jul 1, 2020

Mass Percent

Q. How many grams of each element are in this sample?Enter the number of grams of carbon followed by the number of grams of hydrogen, separated by a c...

Solved • Jul 1, 2020

Mass Percent

Q. What is the percentage of mercury (by mass) in the sample?Express your answer as a percent to four significant figures.Alkyl derivatives of mercury...

Solved • Jul 1, 2020

Mass Percent

Q. Part A. A hydrocarbon is a compound that contains mostly carbon and hydrogen. Calculate the percent composition (by mass) of the following hydrocar...

Solved • Jul 1, 2020

Mass Percent

Q. HCN forms when synthetic fibers containing Orlon or Acrilan burn. Acrilan has an empirical formula of CH2CHCN, so HCN is 50.9% of the formula by ma...

Solved • Jul 1, 2020

Mass Percent

Q. The Fe2+(aq) solution described in Part A was produced by dissolving 4.05 g of ore in acid. What was the percentage of Fe by mass in this ore sampl...

Solved • Jun 30, 2020

Mass Percent

Q. Lead glass contains 18-40% by mass of PbO (instead of CaO in regular glass). Lead glass is still used industrially, but lead crystal drinking goble...

Solved • Jun 30, 2020

Mass Percent

Q. What is the mass % of carbon in dimethylsulfoxide, C2H6SO?

Solved • Jun 15, 2020

Mass Percent

Q. What is the mass percent of carbon in oxalic acid, H2C2O4?

Solved • May 1, 2020

Mass Percent

Q. How many moles of NaF are in 34.2 grams of a 45.5% by mass NaF solution?

Solved • Apr 30, 2020

Mass Percent

Q. What is the mass percent of a solution prepared by dissolving 18.9 grams of solid into 39.5 grams of water? A) 47.8% B) 58.4% C) 32.4% D) The ident...

Solved • Apr 21, 2020

Mass Percent

Q. We dissolve 2.45 g of sugar in 200.0 g water. What is the mass percent of sugar in the solution? A) 1.21% B) 1.23% C) 2.42% D) 123% E) none of the ...

Solved • Apr 21, 2020

Mass Percent

Q. Rank the following fertilizers in decreasing order of mass percentage of nitrogen.- (NH4)H2PO4- (NH4)2SO4- (NH4)2HPO4- KNO3- NH4NO3- NH3

Solved • Apr 15, 2020

Mass Percent

Q. A solution is made containing 12.6 g of methanol CH 3OH (32.04 g/mol) in 154 g of water. H20 (18.02 g/mol)b) Calculate the mass percent of methanol...

Solved • Jan 20, 2020

Mass Percent

Q. The formula for ammonium nitrate is _____?What is the percent composition of nitrogen in a sample of ammonium nitrate?

Solved • Nov 28, 2019

Mass Percent

Q. If 200.0 g of zinc sulfide contains 134.2 g of zinc, how many grams of sulfur can be obtained from 1.18 kg of zinc sulfide?a. 388 g Sb. 79.2 g Sc. ...

Solved • Nov 21, 2019

Mass Percent

Q. Find the percent of KCl if a mixture of KCl and KNO3 is 44.2% potassium by mass.A. 12% B. 8% C. 20% D. 33% E. 40%

Solved • Oct 3, 2019

Mass Percent

Q. Calculate the mass percent composition of lithium ion in Li 3PO4.a. 30.72 %b. 55.27 %c. 20.82 %d. 26.75 %e. 17.98 %

Solved • Sep 30, 2019

Mass Percent

Q. What is the percent composition of chlorine in cobalt(II) chloride hexahydrate?A. 29.8%      B. 24.8%      C. 47.9%D. 39.8%      E. 54.6%

Solved • Sep 18, 2019

Mass Percent

Q. Dimethylcadimum, Cd(CH3)2, is considered to be one of the most dangerous chemicals on Earth. It is volatile, poisonous, carcinogenic and explosive....

Solved • Sep 13, 2019

Mass Percent

Q. What is the mass percent of oxygen in C14H19NO2?

Solved • Sep 1, 2019

Mass Percent

Q. Which of the following compounds has the highest mass percent of O?a. Mn2O3b. MnOc. Mn3O2d. MnO2

Solved • Sep 1, 2019

Mass Percent

Q. What is the mass percent of chlorine in hydrochloric acid?

Solved • Sep 1, 2019

Mass Percent

Q. A 500 gram iron ore sample was determined to contain 242 grams of iron. What is the mass percent of iron in the ore?

Solved • Sep 1, 2019

Mass Percent

Q. Calculating the mass percentages of the elements in benzene after calculating the molecular weight of benzene.

Solved • Aug 25, 2019

Mass Percent

Q. Calculate the mass of oxygen in a molecule of  CO2 by using percentage composition?

Solved • Aug 7, 2019

Mass Percent

Q. A certain metal hydroxide, M(OH)2, contains 32.8% oxygen by mass. What is the identity of the metal M? Please provide explanation and answer.

Solved • Aug 5, 2019

Mass Percent

Q. Li-ion batteries used in automobiles typically use a LiMn2O4 cathode in place of the LiCoO2 cathode found in most Li-ion batteries.Calculate the ma...

Solved • Jan 3, 2019

Mass Percent

Q. Breathing air that contains 4.0% by volume CO2 over time causes rapid breathing, throbbing headache, and nausea, among other symptoms.What is the c...

Solved • Dec 3, 2018

Mass Percent

Q. Calculate the mass percentage of Na2 SO4 in a solution containing 10.6 g Na2 SO4 in 485 g water.

Solved • Dec 3, 2018

Mass Percent

Q. What mass of sucrose (C12H22O11), in grams, is contained in 355 mL (12 oz ) of a soft drink that is 11.5 % sucrose by mass? (Assume a density of 1....

Solved • Dec 3, 2018

Mass Percent

Q. A potassium bromide solution is 7.55% potassium bromide by mass and its density is 1.03 g/mL. What mass of potassium bromide is contained in 35.8 m...

Solved • Dec 3, 2018

Mass Percent

Q. Water softeners often replace calcium ions in hard water with sodium ions. Since sodium compounds are soluble, the presence of sodium ions in water...

Solved • Dec 3, 2018

Mass Percent

Q. Silver nitrate solutions are often used to plate silver onto other metals.What is the maximum amount of silver (in grams) that can be plated out of...

Solved • Dec 3, 2018

Mass Percent

Q. Despite Dalton’s laws, it is now known that many ionic compounds do not always contain atoms in small integer ratios. For example, a sample of iron...

Solved • Nov 27, 2018

Mass Percent

Q. When magnesium metal is burned in air, two products are produced. One is magnesium oxide, MgO. The other is the product of the reaction of Mg with ...

Solved • Nov 12, 2018

Mass Percent

Q. One of the best-selling light, or low-calorie, beers is 4.4 % alcohol by volume and a 12-oz serving contains 110 Calories; remember: 1 Calorie = 10...

Solved • Oct 31, 2018

Mass Percent

Q. Glycine, an amino acid used by organisms to make proteins, is represented by the molecular model below.Calculate the percent nitrogen by mass in gl...

Solved • Oct 31, 2018

Mass Percent

Q. Propenoic acid, C3H4O2, is a reactive organic liquid that is used in the manufacturing of plastics, coatings, and adhesives. An unlabeled container...

Solved • Oct 31, 2018

Mass Percent

Q. Propenoic acid, C3H4O2, is a reactive organic liquid that is used in the manufacturing of plastics, coatings, and adhesives. An unlabeled container...

Solved • Oct 31, 2018

Mass Percent

Q. What is the percentage of nitrogen, by mass, in calcium nitrate?a) 8.54% b) 13.7% c) 17.1%d) 24.2% e) 82.9%

Solved • Oct 31, 2018

Mass Percent

Q. Calculate the percentage of carbon by mass in each of the compounds represented by the following models. (Carbon atoms are black spheres, hydrogen ...

Solved • Oct 31, 2018

Mass Percent

Q. Calculate the percentage of carbon by mass in each of the compounds represented by the following models. (Carbon atoms are black spheres, hydrogen ...

Solved • Oct 31, 2018

Mass Percent

Q. Calculate the percentage of carbon by mass in each of the compounds represented by the following models. (Carbon atoms are black spheres, hydrogen ...

Solved • Oct 31, 2018

Mass Percent

Q. Calculate the percentage of carbon by mass in each of the compounds represented by the following models. (Carbon atoms are black spheres, hydrogen ...

Solved • Oct 31, 2018

Mass Percent

Q. Three common hydrocarbons that contain four carbons are listed here, along with their standard enthalpies of formation:HydrocarbonFormulaHf(kJ/mol)...

Solved • Oct 31, 2018

Mass Percent

Q. Three common hydrocarbons that contain four carbons are listed here, along with their standard enthalpies of formation:HydrocarbonFormulaHf(kJ/mol)...

Solved • Oct 31, 2018

Mass Percent

Q. Three common hydrocarbons that contain four carbons are listed here, along with their standard enthalpies of formation:HydrocarbonFormulaHf(kJ/mol)...

Solved • Oct 31, 2018

Mass Percent

Q. The effectiveness of nitrogen fertilizers depends on both their ability to deliver nitrogen to plants and the amount of nitrogen they can deliver. ...

Solved • Oct 31, 2018

Mass Percent

Q. Hemoglobin, the oxygen-carrying protein in red blood cells, has four iron atoms per molecule and contains 0.340% iron by mass. Calculate the molar ...

Solved • Oct 31, 2018

Mass Percent

Q. A compound whose empirical formula is XF3 consists of 65 % F by mass.What is the atomic mass of X?  Express your answer in grams per mole to two si...

Solved • Oct 31, 2018

Mass Percent

Q. The compound XCl4 contains 74.8% Cl by mass.What is the element X?

Solved • Oct 31, 2018

Mass Percent

Q. Calculate the percentage by mass of oxygen in the following compounds.digitoxin, C41H64O13

Solved • Oct 31, 2018

Mass Percent

Q. Calculate the percentage by mass of oxygen in the following compounds.vancomycin, C66H75Cl2N9O24

Solved • Oct 31, 2018

Mass Percent

Q. Calculate the percentage by mass of the indicated element in the following compounds.Carbon in acetylene, C2H2, a gas used in welding. Express your...

Solved • Oct 31, 2018

Mass Percent

Q. Calculate the percentage by mass of the indicated element in the following compounds.Hydrogen in ascorbic acid, HC6H7O6, also known as vitamin C.  ...

Solved • Oct 31, 2018

Mass Percent

Q. Calculate the percentage by mass of the indicated element in the following compounds.Hydrogen in ammonium sulfate, (NH4)2SO4, a substance used as a...

Solved • Oct 31, 2018

Mass Percent

Q. Calculate the percentage by mass of the indicated element in the following compounds.Platinum in PtCl2(NH3)2, a chemotherapy agent called cisplatin...

Solved • Oct 31, 2018

Mass Percent

Q. Calculate the percentage by mass of the indicated element in the following compounds.Oxygen in the female sex hormone estradiol, C18H24O2

Solved • Oct 31, 2018

Mass Percent

Q. Calculate the percentage by mass of the indicated element in the following compounds.Carbon in capsaicin, C18H27NO3, the compound that gives the ho...

Solved • Oct 31, 2018

Mass Percent

Q. Based on the following structural formulas, calculate the percentage of carbon by mass present in each compound.

Solved • Oct 31, 2018

Mass Percent

Q. Based on the following structural formulas, calculate the percentage of carbon by mass present in each compound.Vanillin (vanilla flavor)

Solved • Oct 31, 2018

Mass Percent

Q. Based on the following structural formulas, calculate the percentage of carbon by mass present in each compound.Isopentyl acetate (banana flavor)

Solved • Oct 31, 2018

Mass Percent

Q. Calculate the percentage by mass of oxygen in the following compounds.morphine, C17H19NO3

Solved • Oct 31, 2018

Mass Percent

Q. Calculate the percentage by mass of oxygen in the following compounds.codeine, C18H21NO3

Solved • Oct 31, 2018

Mass Percent

Q. Calculate the percentage by mass of oxygen in the following compounds.cocaine, C17H21NO4

Solved • Oct 31, 2018

Mass Percent

Q. Calculate the percentage by mass of oxygen in the following compounds.tetracycline, C22H24N2O8

Solved • Oct 31, 2018

Mass Percent

Q. A compound isolated from the rind of lemons is found to be 88.14 % carbon and 11.86 % hydrogen by mass.How many grams of C are there in a 100.1-g s...

Solved • Oct 31, 2018

Mass Percent

Q. A compound isolated from the rind of lemons is found to be 88.14 % carbon and 11.86 % hydrogen by mass.How many grams of H are there in a 100.1-g s...

Solved • Oct 31, 2018

Mass Percent

Q. A compound isolated from the rind of lemons is found to be 88.14 % carbon and 11.86 % hydrogen by mass.How many moles of C?

Solved • Oct 31, 2018

Mass Percent

Q. A compound isolated from the rind of lemons is found to be 88.14 % carbon and 11.86 % hydrogen by mass.How many moles of H?

Solved • Oct 31, 2018

Mass Percent

Q. If someone consumes 23 g of sodium chloride per day, what mass (in grams) of sodium does that person consume? Sodium chloride is 39 % sodium by mass.

Solved • Oct 31, 2018

Mass Percent

Q. What mass (in grams) of iron(III) oxide contains 58.8 g of iron? Iron(III) oxide is 69.94 % iron by mass.

Solved • Oct 31, 2018

Mass Percent

Q. Calculate the mass percent composition of sodium in sodium oxide.

Solved • Oct 31, 2018

Mass Percent

Q. Acetic acid (HC2H3O2) is the active ingredient in vinegar. Calculate the mass percent composition of oxygen in acetic acid.

Solved • Oct 31, 2018

Mass Percent

Q. Iron is mined from the earth as iron ore. Common ores include Fe2 O3 (hematite), Fe3 O4 (magnetite), and FeCO3 (siderite).Calculate the mass percen...

Solved • Oct 31, 2018

Mass Percent

Q. Iron is mined from the earth as iron ore. Common ores include Fe2 O3 (hematite), Fe3 O4 (magnetite), and FeCO3 (siderite).Which ore has the highest...

Solved • Oct 31, 2018

Mass Percent

Q. Iron is mined from the earth as iron ore. Common ores include Fe2 O3 (hematite), Fe3 O4 (magnetite), and FeCO3 (siderite).Calculate the mass percen...

Solved • Oct 31, 2018

Mass Percent

Q. Iron is mined from the earth as iron ore. Common ores include Fe2 O3 (hematite), Fe3 O4 (magnetite), and FeCO3 (siderite).Calculate the mass percen...

Solved • Oct 31, 2018

Mass Percent

Q. The American Dental Association recommends that an adult female should consume 3.0 mg of fluoride (F–) per day to prevent tooth decay. If the fluor...

Solved • Oct 31, 2018

Mass Percent

Q. Because of increasing evidence of damage to the ozone layer, chlorofluorocarbon (CFC) production was banned in 1996. However, many older cars still...

Solved • Oct 31, 2018

Mass Percent

Q. Without doing any calculations, determine which element in each of the following compounds will have the highest mass percent composition.CO

Solved • Oct 31, 2018

Mass Percent

Q. Without doing any calculations, determine which element in each of the following compounds will have the highest mass percent composition.N2O

Solved • Oct 31, 2018

Mass Percent

Q. Without doing any calculations, determine which element in each of the following compounds will have the highest mass percent composition.C6H12O6

Solved • Oct 31, 2018

Mass Percent

Q. Without doing any calculations, determine which element in each of the following compounds will have the highest mass percent composition.NH3

Solved • Oct 31, 2018

Mass Percent

Q. Most fertilizers consist of nitrogen-containing compounds such as NH3, CO(NH2 )2, NH4 NO3, and (NH4 )2 SO4. Plants use the nitrogen content in thes...

Solved • Oct 31, 2018

Mass Percent

Q. Most fertilizers consist of nitrogen-containing compounds such as NH3, CO(NH2 )2, NH4 NO3, and (NH4 )2 SO4. Plants use the nitrogen content in thes...

Solved • Oct 31, 2018

Mass Percent

Q. Most fertilizers consist of nitrogen-containing compounds such as NH3, CO(NH2 )2, NH4 NO3, and (NH4 )2 SO4. Plants use the nitrogen content in thes...

Solved • Oct 31, 2018

Mass Percent

Q. Most fertilizers consist of nitrogen-containing compounds such as NH3, CO(NH2 )2, NH4 NO3, and (NH4 )2 SO4. Plants use the nitrogen content in thes...

Solved • Oct 31, 2018

Mass Percent

Q. Most fertilizers consist of nitrogen-containing compounds such as NH3, CO(NH2 )2, NH4 NO3, and (NH4 )2 SO4. Plants use the nitrogen content in thes...

Solved • Oct 31, 2018

Mass Percent

Q. Copper (II) fluoride contains 37.42% F by mass.Use this percentage to calculate the mass of fluorine (in g) contained in 55.5 g of copper (II) fluo...

Solved • Oct 31, 2018

Mass Percent

Q. Explain how you can use the information in a chemical formula to determine how much of a particular element is present in a given amount of a compo...

Solved • Oct 31, 2018