Chemistry Chemistry Practice Problems Solutions Library

Mass Percent Solutions Library

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70 solutions

Mass Percent

Q. What is the percent Cr, by mass, in the steel sample?A stainless steel alloy is to be analyzed for its chromium content. A 3.50 g sample of the ste...

Solved • Jul 2, 2020

Mass Percent

Q. Part B. A certain metal hydroxide, M(OH)2, contains 32.8% oxygen by mass. What is the identity of the metal M?Percent composition refers to the mas...

Solved • Jul 1, 2020

Mass Percent

Q. What is the concentration, in m/v%, of a solution prepared from 20. g NaCl and 2.0 L of water? A) 5.0% B) 1.0% C) 0.010% D) 10%

Solved • Apr 29, 2020

Mass Percent

Q. The mass/mass percent concentration refers to A) grams of solute in 1 kg of solvent. B) grams of solute in 1 kg of solution.C) grams of solute in 1...

Solved • Apr 29, 2020

Mass Percent

Q. Which fertilizer has the highest nitrogen content?a) NH3b) CO(NH2)2 c) NH4NO3d) (NH4)2SO4

Solved • Apr 23, 2020

Mass Percent

Q. A chloride salt MCl2 is 63.89% chlorine by mass. What is the identity of M? 

Solved • Mar 20, 2020

Mass Percent

Q. Calculate the molarity of an aqueous solution that is 8.1% by mass calcium chloride. You might need to know that the density is 1.10 g/mL. 

Solved • Dec 16, 2019

Mass Percent

Q. Which of the following represents the mass percent of H3PO4 (MM = 98) in a 2.00 m aqueous H3PO4 solution?

Solved • Dec 12, 2019

Mass Percent

Q. Which of the following represents the mass percent of H3PO4 (MM = 98) in a 2.00 m aqueous H3PO4 solution?A. 19.6%B. 16.4%C. 9.8%D. 8.2%

Solved • Dec 11, 2019

Mass Percent

Q. If a solution is 0.5% (w/v), how many mg/ml is that?

Solved • Aug 7, 2019

Mass Percent

Q. In a sample consisting of 1.00 mol NaBr and 0.300 mol KI, what is the mass percent of iodine?

Solved • Jul 10, 2019

Mass Percent

Q. A chloride salt MCl2 is 63.89% chlorine by mass. What is the identity of M?

Solved • Jul 10, 2019

Mass Percent

Q. A stainless steel alloy is to be analyzed for its chromium content. A 5.60g sample of the steel is used to produce 250.0 mL of a solution containin...

Solved • Jul 9, 2019

Mass Percent

Q. Concentrated HCl has a density of 1.19 g/mL and is 38.0% by mass HCl (the rest of the mass is water). How many mL of this concentrated solution do ...

Solved • Jul 9, 2019

Mass Percent

Q. Caffeine (C8H10N4O2) is a stimulant found in coffee and tea. A solution of caffeine in the solvent chloroform (CHCl3) has a concentration of 0.0510...

Solved • Dec 3, 2018

Mass Percent

Q. Commercial aqueous nitric acid has a density of 1.42 g/mL and is 16 M.Calculate the percent HNO3 by mass in the solution.

Solved • Dec 3, 2018

Mass Percent

Q. Lead poisoning is a serious condition resulting from the ingestion of lead in food, water, or other environmental sources. It affects the central n...

Solved • Oct 31, 2018

Mass Percent

Q. Find the percent by mass of sodium chloride in a 1.30 M NaCl solution. The density of the solution is 1.06 g/mL.

Solved • Oct 31, 2018

Mass Percent

Q. If we dissolve 25 grams of salt in 251 grams of water, what is the mass of the resulting solution?

Solved • Oct 31, 2018

Mass Percent

Q. Calculate the percent by mass of KBr in a saturated solution of KBr in water at 10 °C. See Figure 11.17 for useful data, and report the computed pe...

Solved • Oct 29, 2018

Mass Percent

Q. Solutions of hydrogen in palladium may be formed by exposing Pd metal to H2 gas. The concentration of hydrogen in the palladium depends on the pres...

Solved • Oct 29, 2018

Mass Percent

Q. A bottle of wine contains 12.5% ethanol by volume. The density of ethanol (C2H5OH) is 0.789 g/cm3. Calculate the concentration of ethanol in wine i...

Solved • Oct 29, 2018

Mass Percent

Q. A bag of Hersheys Kisses contains the following information:Serving size: 9pieces= 41gramsCalories per serving: 230.Total fat per serving: 13 gEach...

Solved • Oct 25, 2018

Mass Percent

Q. A student determining the %H2O in CuSO4•5H2O obtains the following data. What is the %H2O in the sample for this experiment? 

Solved • Oct 23, 2018

Mass Percent

Q. Enter your answer in the provided box. A sample of 5.98 g of naphthalene (C10H8) is dissolved in 73.8 g of benzene (C6H6). Calculate the percent by...

Solved • Oct 23, 2018

Mass Percent

Q. What mass of HCl is contained in 45.0 mL of an aqueous HCl solution that has a density of 1.19 g cm–3 and contains 37.21% HCl by mass?

Solved • Oct 16, 2018

Mass Percent

Q. What mass of solid NaOH (97.0% NaOH by mass) is required to prepare 1.00 L of a 10.0% solution of NaOH by mass? The density of the 10.0% solution i...

Solved • Oct 16, 2018

Mass Percent

Q. What mass of a 4.00% NaOH solution by mass contains 15.0 g of NaOH?

Solved • Oct 16, 2018

Mass Percent

Q. Consider this question: What mass of a concentrated solution of nitric acid (68.0% HNO3 by mass) is needed to prepare 400.0 g of a 10.0% solution o...

Solved • Oct 16, 2018

Mass Percent

Q. Citric acid (right) is concentrated in citrus fruits and plays a central metabolic role in nearly every animal and plant cell. How many moles of ci...

Solved • Oct 4, 2018

Mass Percent

Q. A solution is prepared by dissolving 23.7 g of CaCl 2 in 375 g of water. The density of the resulting solution is 1.05 g/mL. The concentration of C...

Solved • Oct 1, 2018

Mass Percent

Q. A student is running an experiment in which 70.1 grams of MnSO4 is needed, but the only jar of reagent in the lab is labelled manganese(II) sulfate...

Solved • Sep 28, 2018

Mass Percent

Q. Enter your answer in the provided box.Calculate the mass % of Br in barium perbromate.

Solved • Sep 27, 2018

Mass Percent

Q. How many grams of NiF2, are there in 191 grams of an aqueous solution that is 6.65 % by weight NiF2.

Solved • Sep 26, 2018

Mass Percent

Q. You wish to prepare 210 grams of 16.2 % FeCl3. You will need ______ grams of iron(III) chloride and _______ mL of water. Assume that the density of...

Solved • Sep 26, 2018

Mass Percent

Q. You need to dissolve CaCl2 in water to make a mixture that is 36.5% calcium chloride by mass. If the total mass of the mixture is 180.7 g, what mas...

Solved • Sep 19, 2018

Mass Percent

Q. Calculate the percent composition of the following compounds. Write all values to two decimal places.

Solved • Sep 18, 2018

Mass Percent

Q. Isopropyl alcohol is mixed with water to produce a 31.0% (v/v) alcohol solution. How many milliliters of each component are present in 665 mL of th...

Solved • Sep 18, 2018

Mass Percent

Q. A particular coal contains 2.55% sulfur by mass. When the coal is burned, it produces SO2 emissions which combine with rainwater to produce sulfuri...

Solved • Sep 17, 2018

Mass Percent

Q. A 3.56 g sample of a laboratory solution contains 1.97 g of acid. What is the concentration of the solution as a mass percentage?

Solved • Sep 13, 2018

Mass Percent

Q. How many grams of Al(NO3)3 are present in 58.9 g of a(n) 12.4% by mass Al(NO3)3 (aq) solution? Enter only a numerical answer. Do not include units.

Solved • Sep 11, 2018

Mass Percent

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

Solved • Sep 11, 2018

Mass Percent

Q. An alloy contains 69 g of pure gold and 37 g of pure zinc. What is the percentage of zinc in the alloy? Express your answer to two significant figu...

Solved • Sep 7, 2018

Mass Percent

Q. An alloy contains 59 g of pure silver and 20 g of pure copper. What is the percentage silver in the alloy? Express your answer to two significant f...

Solved • Sep 7, 2018

Mass Percent

Q. A certain ore is 33.7% nickel by mass. How many kilograms of this ore would you need to dig up to have 60.0 g of nickel? 

Solved • Sep 6, 2018

Mass Percent

Q. A solution was prepared by dissolving 32 g of KCl in 225 g of waterCalculate the mass percent of KCl in the solution

Solved • Sep 6, 2018

Mass Percent

Q. A chemist mixes 87. g of acetone with 93. g of 1-bromobutane and 94. g of thiophene. Calculate the percent by mass of each component of this soluti...

Solved • Sep 5, 2018

Mass Percent

Q. Be sure to answer all parts.Calculate the amount of water (in grams) that must be added to each of the following substances to produce the indicate...

Solved • Sep 5, 2018

Mass Percent

Q. A 4.97 g sample of a laboratory solution contains 1.03 g of acid. What is the concentration of the solution as a mass percentage?

Solved • Aug 21, 2018

Mass Percent

Q. Table salt, NaCl(s), and sugar, C12H22O11 (s), are accidentally mixed. A 5.50-g sample is burned, and 1.60 g of CO2 (g) is produced. What was the m...

Solved • Aug 21, 2018

Mass Percent

Q. What is the mass percentage of iodine (I2) in a solution containing 3.0 x 10-2 mol I in 140 g of CCL4? Express your answer using two significant fi...

Solved • Aug 14, 2018

Mass Percent

Q. How many grams of Na2CO3 are present in 12.4 mL of a solution that is 39.0% Na2CO3, by mass. The density of the solution is 1.19 g/mL. 

Solved • Aug 14, 2018

Mass Percent

Q. The amount of nitrogen in an organic substance can be determined by an analytical method called the Kjeldahl method, in which all the nitrogen in t...

Solved • Aug 14, 2018

Mass Percent

Q. Load is a basic metal that affects the central nervous system. A Pb-water sample contains 0.0011 % Pb by mass.How much of the water (in mL) contain...

Solved • Aug 8, 2018

Mass Percent

Q. Hydrochloric acid is usually purchased in a concentrated from that is 37.0%. HCl by mass and has a density of 1.20 g/mL. Part A How much concentrat...

Solved • Aug 8, 2018

Mass Percent

Q. Be sure to answer all parts.Calculate the amount of water (in grams) that must be added to each of the following substances to produce the indicate...

Solved • Aug 8, 2018

Mass Percent

Q. A food chemist determines the concentration of acetic acid in a sample of apple vinegar by acid-base titration. The density of the sample is 1.01 g...

Solved • Jul 16, 2018

Mass Percent

Q. The iron in a 6.655-g sample containing some Fe 2O3 is reduced to Fe2+. The Fe2+ is titrated with 15.67 mL of 0.1517M K2Cr2O7 in an acid solution. ...

Solved • Jul 3, 2018

Mass Percent

Q. A 7.91 g sample of an aqueous solution of hydrochloric acid contains an unknown amount of the acid. lf 10.6 mL of 1.55 M sodium hydroxide are requi...

Solved • Jul 3, 2018

Mass Percent

Q. A sample weighing 3.093 g is a mixture of Fe 2O3 (molar mass = 159.69) and Al 2O3 (molar mass = 101.96). When heat and a stream of H2 gas is applie...

Solved • Jun 25, 2018

Mass Percent

Q. For a plant food labeled 23-19-17, calculate: Your answer should be in two significant figures. a % nitrogen  b. % phosphorus  c. % potassium  Calc...

Solved • Jun 5, 2018

Mass Percent

Q. How many moles of each substance are needed to prepare the following solutions? Part A 67.0 mL of 9.5% m/v KCI (MW 74.55 g/mol)Express your answer ...

Solved • May 21, 2018

Mass Percent

Q. An aqueous KNO3 solution is made using 87.6 g of KNO3 diluted to a total solution volume of 1.51 L. (Assume a density of 1.05 g/ml for the solution...

Solved • Apr 3, 2018

Mass Percent

Q. An aqueous KNO3 solution is made using 70.5g of KNO 3 diluted to a total solution volume of 1.97 L .a. Calculate the molarity of the solution. (ass...

Solved • Mar 23, 2018

Mass Percent

Q. 12.00 grams of acetic acid HC2H3O2 (Molar mass= 60.00 g/mol) are dissolved in 188.0 grams of water. Density of solution is 1.12g/mL.a. What is the ...

Solved • Feb 15, 2018

Mass Percent

Q. A solution is prepared by mixing together cyclohexane (C 6H12, MW = 84.16 g/mol) and p-xylene (C6H4(CH3)2), MW = 106.17 g/mol). The mole fraction o...

Solved • Oct 31, 2017

Mass Percent

Q. A stock solution of hydrofluoric acid is 15 M and has a density of 0.99 g/mL at 25 °C. What is the mass percent of HF at 25 °C?a. 15%b. 30%c. 45%d....

Solved • Jul 25, 2017

Mass Percent

Q. What is the percent CdSO4 by mass in a 1.0 molal aqueous CdSO4 solution?A. 0.10 %B. 20.8 %C. 17.2 %D. 24.4 %E. 0.001%

Solved • Mar 6, 2017

Mass Percent

Q. Determine the percent sulfuric acid by mass of a 1.37 m aqueous solution of H  2SO4.A) 0.1342%B) 11.84%C) 13.42%D) 13.98%E) 1.37% 

Solved • Nov 15, 2016

Mass Percent

Q. The chemist must prepare 1.00 kg of 15.0% (w/w) acetic acid using a stock solution which is 36.0% (w/w) acetic acid (d = 1.045 g/mL). Which of the ...

Solved • Aug 25, 2016