Percent Concentration

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Questions

• How can the concentration of water in solution be decreased?
• How can the concentration of a solution be increased?
• How do you find the concentration of a solution in ppm?
• How do you make a 10 percent solution?
• How do you make a 2 percent solution?
• What is the weight per volume method to calculate concentration?
• What percent concentration of KCl would be isotonic?
• What is the percent concentration of sodium chloride in normal saline?
• What is the percent concentration of a 6m solution of NaCl?
• What is the percent concentration formula?
• If you mix 150 grams of a 22% sugar solution and 250 grams of a 16% sugar solution, what percent of the mixture is sugar?
• What is the percent concentration of a 300-mm solution of CaCl2?
• How many pints of each 2 percent and 7 percent acid solutions must be mixed to obtain 50 pints of a 5 percent solution?
• If you have 20 mL of alcohol n a 100 mL solution what percent of concentration of the solution by volume?
• How much alcohol is in a 9-oz solution of water and alcohol that is 20% alcohol?
• What do you divide the mass of to calculate the percent concentration of a solution?
• How can I find percent concentration from density?
• How many liters of 20% alcohol solution should be added to 40 liters of a 50% alcohol solution to make a 30% solution?
• How can I convert percent concentration to ppm?
• How can I convert percent concentration to molarity?
• How can I change percent concentration?
• How can I calculate percent concentration from molarity?
• How can I calculate percent concentration by mass?
• How can I calculate percent concentration by volume?
• What is the percent by volume of ethanol in the solution? 60 mL of ethanol is diluted with water to a final volume of 400 mL.
• How can I express this concentration in parts per million? Water supplies with dissolved calcium carbonate greater than 500 mg/L are considered unacceptable for most domestic purposes.
• Milk fat is present in milk. Whole milk usually contains about 5.0% milk fat by volume. If I drink a glass of milk with a volume of 250 mL, what volume of milk fat have I consumed?
• How can I calculate the concentration of a solution in mass percent?
• How can I calculate the percent concentration of a solution?
• What are some examples of percent concentration?
• What is percent concentration?
• Question #edd2c
• Question #1266e
• Question #422bb
• Question #20474
• Question #816b8
• Question #2ca85
• Question #82eec
• Question #9b6bc
• What is the mass of a #"7% HCl"# solution in which #"45.0 HCl"# has been dissolved?
• Question #ade66
• Question #f1ee8
• Question #755d3
• Question #d8f3a
• Question #db8f3
• Question #0b93d
• Question #eb6b6
• Question #104b8
• Question #d35f2
• Question #278e0
• Question #8dd63
• Question #8f15a
• How much would a dosage of 12ml 10% Potassium Iodide (KI) w/v solution increase Iodide levels in a total voluve of 800 liters?
• Question #9a862
• Question #bfeb7
• Question #f2b83
• Question #24972
• Question #4feb9
• You have 1 L of 100 proof (50% V/V) Scotch whisky (ethanol, #C_2H_5OH#). Calculate the molarity, the mole fraction, the molality of the ethanol and if the temperature drops to -10C could you still drink the whisky? Density of ethanol =0.79g/ml kf=-1.86C/m
• Question #73137
• Question #7444f
• Question #796ac
• Question #46792
• Question #5daf3
• Question #63908
• Question #66caa
• Question #19ef4
• Question #90394
• Question #11471
• Question #0c887
• Question #58bdc
• What is the mass percent of a solution that contains 45.6 grams ethanol (#C_2H_6O#) in 254 grams of water?
• What is the percent by mass of a solution that is prepared by mixing 3.785 grams of sodium chloride with 43.7 milliliters of water (assume the density of water is 1.00 g/mL)? Thanks!?
• Question #08fe4
• Numerical: How will you prepare a 0.75% #Na_2CO_3# solution?
• Question #388f4
• Question #75dda
• 10 #cm^3# of #H_2O_2# solution when reacted with #KI# solution produced 0.5 #g# of iodine. Calculate the percentage purity of #H_2O_2#?
• A chemist has 400 grams of salt solution that is 10% salt. How many grams of 20% salt solution must be added to obtain a 12% solution of salt?
• How many liters of pure acid should be added to 25 liters of a 60% solution of acid to obtain a 75% acid solution?
• How much pure acid must be added to 6 milliliters of a 5% acid solution to produce a 40% acid solution?
• An after shave lotion contains 50% ethyl alcohol. How much water must be added to 6 fluid ounces of this lotion to reduce it to one which is 75% nonalcoholic?
• A 280 mL solution is 20% salt. How much water should be added to make the solution 14% salt?
• Question #a518c
• Question #a6a3b
• Question #2b6d2
• Question #efc46
• Question #392bf
• The doctor orders a medication as #"5.00 mg/kg"# of body weight. The dosage the nurse gives the patient is #"425 mg"#. How much does the patient weigh in pounds?
• Question #019f5
• Question #b81e1
• Question #63ac3
• Question #9b1c1
• Question #c25e3
• Question #fee36
• Question #c8e75
• Question #9356d
• Question #0db2c
• Question #df6fa
• Question #a1ef4
• 20mL of orange juice (citric acid), weighing 20.31g, was neutralized by 20.4mL, 0.0900M of NaOH. Given the following equation: C6H8O7 + 3NaOH --> Na3C6H5O7 + H2O. What is the percentage by mass of citric acid in the orange juice?
• How many grams of HCI are there in 100.0 mL of concentrated HCl which is approximately 12.1M and 37% HCl by weight and the density of 1.191 g/mL?
• I have 2oz concentrated 40% aqueous solution, I want to dilute it 10% , How I dilute it ??? Please I need you kind help. Thank you
• Question #72f77
• How many liters of a solution containing 45% acid must be mixed with a solution containing 60% acid to obtain 40 liters of a 48% acid solution?
• An aqueous solution of 4.62 M potassium bromide, KBr, has a density of 1.37 g/mL. What is the percent by mass of KBr in the solution?
• An aqueous solution of 3.47 M silver nitrate, #AgNO_3#, has a density of 1.47 g/mL. What is percent by mass of #AgNO_3# in the solution?
• An aqueous solution is 34.0 % by mass ethanol, #CH_3CH_2OH#, and has a density of 0.947 g/mL. What is the mole fraction of ethanol in the solution?
• Question #474ca
• How many grams of KI are in 25.0 mL of a 3.0% (m/v) KI solution?
• Question #06b85
• What volume of 2.5% (m/v) KOH can be prepared from 125 mL of a 5.0% KOH solution?
• How many grams of acetic acid should be dissolved in 100.0 g of water to make a 4.0 percent (by mass) solution of vinegar?
• A student has a stock solution of 30.0% w/v hydrogen peroxide, #H_2O_2#, solution. How should the student prepare 250 mL of a 0.25% w/v #H_2O_2# solution?
• Question #e1635
• Question #6a5d8
• Question #651e9
• A certain beverage contains 7.700% ethanol #(C_2H_6O)# by mass. What volume of this beverage in milliliters contains 3.150 moles of ethanol?
• Question #e1d08
• Question #8c280
• Question #19987
• You have 1500.0 g of a bleach solution. The percent by mass of the solute sodium hypochlorite, #NaOCl#, is 3.62%. How many grams of #NaOCl# are in the solution?
• A pharmacist wishes to mix a solution that is 4% Minoxidil. She has on hand 60 ml of a 3% solution and wishes to add some 6% solution to obtain the desired 4% solution. How much 6% solution should she add?
• A sample of seawater contains 6.277 g of sodium chloride per liter of solution. How many mg of sodium chloride would be contained in 15.0 mL of this solution?
• 9 qt. of a 80% sugar solution was mixed with 1 qt. of a 50% sugar solution. What is the concentration of the mixture?
• Question #7ea5f
• Question #b3e94
• Eduardo wants to make 17.1 fl. oz. of a 60% sugar solution by mixing together a 80% sugar solution and a 50% sugar solution. How much of each solution must he use?
• Question #aaf98
• Emily mixed together 9 gal. of Brand A fruit drink and 8 gal. of Brand B fruit drink which contains 48% fruit juice. What is the percent of fruit juice in Brand A if the mixture contained 30% fruit juice?
• Question #535af
• Question #6d84d
• Question #04a67
• Question #ab45a
• How many grams of sugar would you need to add to water to make 235 grams of a 7% solution? using this formula: (Please Help!)
• A chemist has one solution containing 30% insecticide and another solution containing 50% insecticide. How much of each solution should the chemist mix to get 200 L of a 42% insecticide?
• Question #03a15
• A pitcher contains 2 L of a solution whose concentration is 25 g/L. How many grams of solvent would be in 1L of the solution?
• A farmer has 100 gallons of 70% pure disinfectant. He wishes to mix it with the disinfectant which is 90% pure to obtain 75% pure disinfectant. How much of the 90% disinfectant must he use?
• How many kilograms of water must be evaporated from 40 kg of a 10% salt solution to produce a 25% solution?
• How does the concentration of #0.090*mol*L^-1# #HCl(aq)# compare to #0.90*mol*L^-1# #HCl(aq)#?
• How come analysis of commercial bleaching solutions will often show a lower #OCl^-# ion content than is advertised on the bottle?
• Question #5c10a
• Limewater is used to find out if #"CO"_2# is present. How much (in grams) of limestone, that contains 95% calcium carbonate will we need to get 80g 7% of limewater?
• Question #863ff
• Question #a4ff2
• Question #c814d
• What is meant by the mass/mass percent concentration of a solution?
• Question #cba82
• Question #03d29
• Question #56180
• Question #1c1fe
• Question #ca323
• A particular type of hops contains 15.4 % m/m acids. If 25 mL of methanol contains 1.00 g of hops, what is the percent by mass of acids in the solution?
• How many milliliters of a 25% (m/v) #NaOH# solution would contain 75 g of #NaOH#?
• Question #48318
• Question #07095
• If you need to make a 5.6% solution of #NaCl# using 9.6g of #NaCl#, how many grams of water is needed?
• What is the mass percent of sodium in #NaCl#?
• Question #4492b
• Question #f76b6
• If 17.8 grams of #KOH# dissolve in enough water to make a 198-gram solution, what is the concentration in percent by mass?
• What is the mole fraction of #KCl# in an aqueous solution that contains 26.3% #KCl#?
• Question #ec7e1
• Question #84561
• 225 grams of #NH_4NO_3# in 2.5 liters of water has what concentration?
• What is the mass percent (m/m) concentration of a solution of 10.0 g of sodium chloride in 100 g of solution?
• How many grams of potassium chloride are in 45.0 g of a 5.00% (by mass) solution?
• Question #a69e3
• Question #2997a
• How do we define #"area"# and #"volume"# dimensionally?
• Please guide me : i have 0.5 grams of solid waste sample. It is acid digested and then diluted to 500 ml. This is tested for chromium by atomic absorption and the conc came out to be .243 mg/l. what will be the actual concentration in the solid sample?
• Question #00e26
• How does the concentration of an alcohol - water solution affect the volume contraction?
• Question #70ea1
• How many moles of sodium chloride solute are in 155 grams of an 85.5 percent by mass solution?
• Question #f0918
• What is the percent by mass of #NaHCO_3# in a solution containing 50 g #NaHCO_3# dissolved in 750 mL of water?
• What is meant by a #"good solvent"# for recrystallization?
• To reduce 16 ounces of a 25% solution of antiseptic to a 10% solution, how much distilled water should a nurse add?
• If the mole fraction of #"K"_2"SO"_3# in a solution is 0.0328, what is the percent by mass of #"K"_2"SO"_3#?
• Sulfuric acid has a molar mass of 98 g/mol. In the laboratory there is 100 mL of a 0.10 M sulfuric acid solution. How much water needs to be added to this volume to prepare a solution containing 4.9 g/L of sulfuric acid?
• Question #b372f
• 20g of NaCl were added to an 8% 180g of NaCl solution. What is the mass percent of NaCl in the solution now?
• When 56 grams of #NaCl# are dissolved in enough water to create a 125 gram solution, what is the solution's concentration, expressed in percent by mass?
• What is the percent by volume of isopropyl alcohol in a solution made by dissolving 18.9mL of isopropyl alcohol in 412mL of water?
• A solution is made by dissolving 3.60g of sodium chloride to a final volume of 115mL solution. What is the weight/volume % of the solute?
• A solution is made by dissolving 4.87 g of potassium nitrate to a final volume of 86.4 mL solution. What is the weight/volume of the solute?
• A solution is made containing 22.8g of magnesium nitrate per 325g of water. What is the percent by mass of the solute?
• A solution is made by dissolving 29 g of sodium chloride to a final volume of 202 mL solution. What is the mass/volume % of the solute?
• If 42.9mL rubbing alcohol is dissolved of in water to make 215mL of solution, what is the concentration expressed in volume/volume % of the solute?
• A solution is made containing 11.2g of sodium sulfate per 95.0g of water. What is the percent by mass of the solute?
• A solution is made containing 4.6g of potassium chloride per 64.0g of water. What is the weight/weight % or percent by mass of the solute?
• How many grams of solute are needed to prepare a 3.50% mass/mass solution that has a solution mass of #2.5 * 10^2# grams?
• If a solution has a #40%# mass (in grams)to volume (in milliliters) ratio; what will be the volume corresponding to a mass of 70 grams?
• If a 0.5 L container of juice contains 15 g of sugar, what is the concentration of sugar?
• Question #846b3
• What is the percent by mass of #NaHCO_3# in a solution containing 20 g #NaHCO_3#, dissolved in 600 mL #H_2O#?
• Given a mixture of barium chloride, and potassium chloride, how would we separate one salt from the other?
• Question #82823
• Question #92cc8
• Question #eb6dd
• Question #9932a
• What mass of solution containing 5.00% potassium iodide, #KI#, by mass contains 258 mg #KI#?
• Asolution is made by dissolving 14.0g of potassium chloride to a final volume of 78.9mL solution. What is the weight /volume % of the solute?
• Question #4393b
• Question #ba500
• Question #0f80d
• Question #14940
• Question #cb5de
• What is the concentration in #"%w/v"# of sodium sulfate when #"9.74 g"# of it is placed into a #165# volume?
• What is the mass percent of a #22.8*g# mass of solute, that is dissolved in a #325*g# mass of solvent?
• Question #0be71
• A bottle of wine contains 12.5% ethanol (#CH_3CH_2OH#) by volume. The density of ethanol is 0.789 g/cm^3 and the density water is 1.000 g/cm^3. How do you calculate the concentration of ethanol in terms of mass percent of ethanol?
• In order for either ethyl or isopropyl alcohol to be considered a general purpose disinfectant it must have what percent alcohol content?
• Amixture was found to contain 1.50 g #NH_4Cl#, 0.80 g #NaCl#, and 1.20 g #SiO_2#. What is the percentage of sand in this mixture?
• Question #91d1f
• A 45.0g aqueous solution is made using 10.0g of ethanol. What percentage of the solution is ethanol?
• Question #6a626
• What is the mass of solution that is #28.1%# #"(w/w)"# with respect to sugar that contains #65.5*g# of solution?
• Question #f273e
• Beaker A contains a 10% salt solution. What percent water would it contain?
• To make a 50% solution of carbon tetrachloride in benzene, how much carbon tetrachloride should be added to #100*mL# of benzene?
• Question #3285c
• Question #67cea
• How many grams of solute are present in #"2500 g"# of a sodium hypochlorite solution that is #"5.24% m/m"# ?
• An ammonia solution is 6.00 M and the density is 0.950 g/mL. What is the mass/mass percent concentration of #NH_3# (17.04 g/mol)?
• An ammonia solution is 6.00 M and the density is 0.950 g mL. What is the mass/mass percent concentration of #NH_3# (17.03 g/mol)?
• Question #2985b
• What do we mean by percentage concentration?
• Question #066f0
• Question #10e83
• Question #9a02f
• Question #91ed4
• How much water should be evaporated from 20 L of a 20% salt solution to increase it to a 25% salt solution?
• How is a #5*%v/v# solution of methanol in water prepared?
• How do you write conversion factors that correspond to the following concentration: 0.15% (v/v) acetic acid?
• Question #6228f
• How many milliliters of alcohol are in 167 mL of an 85.0% (v/v) alcohol solution?
• Question #d80bb
• Question #7d6ae
• Question #d2b20
• Question #69a89
• Question #87882
• What is molar concentration of Compound #"Q"# in a 31 % by mass stock solution with a density of #"1.12 kg/dm"^3#? What volume of the stock solution would you need to make #"500 cm"^3# of #"5 mol/dm"^3color(white)(l)"Q"#?
• What is the mass percent of 400 mLof a solution that contains 60.0 g of calcium chloride?
• Question #6e801
• Question #fa212
• How many millilieters of a 12% (v/v) propyl alcohol solution would you need to obtain 5.7 mL of propyl alcohol?
• A pharmacist has one solution that is 40% iodine and 60% water, and another solution that is 3% iodine. How many liters of each solution should the pharmacist use to make 11 liters of a solution that is 19% iodine?
• Question #010b9
• Question #24b8e
• Question #34902
• Question #07a44
• What mass of a 10 % solution must I add to a 20 % solution to get 500 g of a 17.5 % solution?
• The molecular mass of albumin is 60 kDa. What is the concentration of a 1.2 % m/m solution of albumin in milligrams per millilitre? What is the molar concentration?
• Question #26712
• Which statement is incorrect?
• What is the percent of change if 24 is increased to 90?
• Question #48627
• Question #7a0d4
• What volumes of a 2 % solution and a 6 % solution must I mix to get 300 mL of a 5 % solution?
• Question #8baf6
• How do we dilute concentrated hydrochloric acid to give 10% #HCl#?
• Question #76765
• A solution is made by dissolving 3.60g of sodium chloride to a final volume of 115mL solution. What is the weight/volume percent of the solute?
• What percentage of water vapor is found in the air?
• Question #cb299
• A student wants to investigate the amount of Ascorbic acid in orange juice, with a simple NaOH titration what other substances/compounds of the juice might interfere the results, to which extent?
• A student adds 6.00 g of a solid to 30.0 ml of water. What is the concentration of this solution expressed as mass/volume percent?
• Question #b082f
• Question #b83a8
• Question #c76e9
• Question #bc6af
• How many grams of solute are present in a #"1500-g"# sample of a #3.62%# by mass solution of sodium hypochlorite?
• Question #24c97
• Question #0dcf7
• Question #fa590
• How do you make a #600*mL# volume of #20%*("w/w")# caustic soda in water?
• Question #fb0be
• Question #4ae2d
• Question #ffcee
• A 5.00 mL sample of a solution of KCl (Mwt=74.6 g/mol) in water (Mwt=18.01 g/mol) weighs 5.20 g. The water is evaporated off leaving 0.26 g of residue. What is the mass of solution that would contain 1.00 g of KCl?
• Question #3470c
• How would you calculate the percent composition of nitric acid #HNO_3#?
• Question #24b1e
• Question #fbe14
• How much water should we add to prepare #2%# acetic acid from #5%# acetic acid?
• Question #6ccb6
• Question #5f7d6
• Question #86f6e
• What is the volume of alcohol present in 620 mL of a 40.0% (viv) solution of alcohol?
• Question #f11c8
• Question #12208
• What mass of sugar exists in a #754.83*mL# volume of #12.38%(m/v)# of glucose?
• Question #db449
• Question #ffbb0
• Question #6ec6f
• What is the percentage concentration of a #29*g# mass of solute that is dissolved in a #202*mL# volume of aqueous solution?
• What is the concentration with respect to #g*L^-1# of a solution prepared by dissolving #1.72*g# of #"potassium permanganate"# in #60.0*mL# of water?
• Question #7a5fb
• Question #ce94f
• Question #60b08
• What is the percent by mass of #"12 M HCl"#?
• In a #100%# #"m/m"# solution, how many grams of solute are present in a #100*g# mass of solution...?
• How do you calculate the grams solute required to make the following solution: 2.5 L of 0.90% of NaCl (m/v)?
• Question #9d8f3
• Question #998fe
• Question #4359c
• Question #591bb
• Question #a939a
• Question #cd3b0
• Question #48506
• Sea water contains #65 xx10^-3# #"g/L"# of bromide ions. If all the bromide ions are converted to produce #Br_2#,how much sea water is needed to prepare 1 kg of #Br_2#? please tell the method.
• What is the #"molality"# of a #200*g# mass of sugar dissolved in a mass of #100*g# of water?
• Help me please! (?)
• Question #3fc19
• A solution of rubbing alcohol is 74.3% (v/v) isopropanol in water. How many mililiters of Isopropanol are in 62.4 mL sample of the alcohol solution?
• Question #6547e
• Question #26561
• Question #50bb0
• What is the concentration by volume if a solution is prepared by adding #25*mL# of #"ethyl alcohol"# to #125*mL# of water?
• A #15*g# mass of solute was dissolved in a mass of water to give a #15%# #"w/w"# solution. What was the mass of water used to make the solution?
• What is the mass percent of a solution that is #10.5*mol*L^-1# with respect to #NaOH#, and for which #rho_"solution"=1.33*g*mL^-1#...?
• How do chemists report concentrations?
• Question #a9bde
• Question #aa335
• What is #"70% (v/v)"# ethyl alcohol? And what constitutes the other #"30%"#?
• Question #d4d24
• Question #7bb32
• Question #53186
• Question #19f01
• Question #396cc
• What is #"volume percent"# of a #10*g# mass of solute dissolved in a #150*g# mass of solvent?
• Question #12f0d
• Question #a5016
• How is a #35%# #"w/w"# solution of a #200*g# mass of sodium chloride in water prepared?
• Question #97eda
• Question #4e924
• Question #aadce
• Question #ab100
• Mole fraction of ethanol in ethanol and water mixture is 0.25. Hence percentage concentration of ethanol by weight of mixture is?
• An aqueous solution of concentrated hydrobromic acid contains 48% HBr by mass. If the density of the solution is 1.5 g / mL, What is its concentration?
• Question #1c985
• Question #1a1fa
• Question #2ebba
• Question #45384
• Question #ad51c
• Question #4cd3a
• What is the molar concentration of #68%# #"nitric acid"#, for which #rho_"acid"=1.41*g*mL^-1#?
• What is the concentration of a #1*mL# volume of a solution of #37%# #HCl# #(rho=1.18*g*mL^-1)# that is diluted to #3.50*mL#?
• Question #0c3b7
• 0.543g of CaCl2 was dissolved in enough water to make a 500ml solution. What is the concentration of Cl- in %w/v?
• Question #61d61
• Question #afd22
• Question #e1868
• A solution of HCl in water has a density of 1.1 g/mL. What is the mass% of HCl in the solution if 150 mL of the solution contains 30. g of HCl?
• Question #82ae2
• Question #231c3
• Question #ba9ef
• Question #b22b0
• Question #f3a0d
• Question #e042c
• Question #1ee3f
• Question #af574
• Question #21437
• Question #42208
• Question #db9c5
• If we have #5.5%# #"m/m"# solution with respect to a solution....what is the mass of solute in a #2000*g# mass of solution...?
• Question #8df2c
• Question #37461
• How many grams of solute are in #"2.5 L"# of a solution which is #"20% w/v"# ?
• Calculate the amount of water, in grams, that must be added to prepare #16%# by mass solution with #"5.0 g"# of urea, #"(NH"_2)_2"CO"# ?
• Question #983bc
• The concentration of aqueous methanol is 10% of its mass. What is the molar fraction of methanol?
• Question #865b5
• Question #6dd4c
• What is the mass/volume percent of 34.5g NaCl in 165mL solution?
• What are the mole fractions of hydrochloric acid #("HCl")# and water in a #20%# #"w/w"# aqueous #"HCl"# solution?
• Question #76a7e
• How do I calculate molality to percent by mass?
• What is the %m/m of 75.0 g of ethanol dissolved in 500.0 g of water?
• The concentration of urea in a solution prepared by dissolving 16 g of urea in 39 g of is __________% by mass. The molar mass of urea is 60.0 g/mol??
• What is the weight/weight % of 9.74g of sodium sulfate to a final volume of 165 mL of solution?
• What would be the final volume of a 10.4% (m/v) solution made from 5.00 g of solute?
• What is the mole fraction of #"Na"_2"SO"_4# in a solution which is #11.5%# by weight #"Na"_2"SO"_4# ?
• What mass of #"NaBr"# is needed to prepare #"50.00 mL"# of a #6.5%# (m/v) solution in distilled water?
• What is the concentration in % mass (m/v) of a solution if you dissolve 1.25 g NaCl in 25.00 mL DI H2O?
• What mass of a 0.337% KCN solution contains 696 mg of KCN? Thank you!
• If 5.0 g of NaOH are dissolved in water to give 250.0 g total mass of solution, what is the % concentration (w/w)?
• If a solution is 0.5% (w/v), how many mg/ml is that?
• How many grams of glucose must be added to 275 g of water in order to prepare percent by mass concentration of aqueous glucose solution 1.30% ?
• What is the percent by mass of KBr if 58.2 grams are dissolved in 344 grams of water?