Chemistry concepts and calculations
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1. 21 million Joules of chemical energy are supplied to a boiler in a power plan
1. 21 million Joules of chemical energy are supplied to a boiler in a power plant. 5,000,000 Joules of energy are lost up the smokestack. The boiler radiates 1.5 million Joules of…
1. 24.49 mL of a solution of the acid H 2 C 2 O 4 is titrated, and 84.00 mL of 0
1. 24.49 mL of a solution of the acid H2C2O4 is titrated, and 84.00 mL of 0.2500-M NaOH is required to reach the equivalence point. Calculate the original concentration of the aci…
1. 25.00 mL of a 0.0060 M solution of sodium hydroxide was titrated with 0.010 M
1. 25.00 mL of a 0.0060 M solution of sodium hydroxide was titrated with 0.010 M hydrochloric acid using methyl red indicator. a. Calculate the volume of HCl at equivalence point.…
1. 2C8H18+25O2------>16CO2+18H2O how many moles of CO2 are emitted into the atom
1. 2C8H18+25O2------>16CO2+18H2O how many moles of CO2 are emitted into the atomosphere when 17,6 g of C8H18 is burned 2. complete this reaction to show how pyridine, C5H6NH ac…
1. 2C8H18+25O2------>16CO2+18H2O how many moles of CO2 are emitted into the atom
1. 2C8H18+25O2------>16CO2+18H2O how many moles of CO2 are emitted into the atomosphere when 17,6 g of C8H18 is burned 2. complete this reaction to show how pyridine, C5H6NH ac…
1. 2COF2 yields CO2+CF4 Kc=7.10 If only COF2 is present initially at a concentra
1. 2COF2 yields CO2+CF4 Kc=7.10 If only COF2 is present initially at a concentration of 2M what concentration of COF2 remains at equilibrium? 2. CO+NH3 yields HCONH2 Kc=.770 If a …
1. 2H2O( g )->2H2( g )+O2( g ) a) rate of delta[H2O]/delta t ? b) rate of delta[
1. 2H2O(g)->2H2(g)+O2(g) a) rate of delta[H2O]/deltat ? b) rate of delta[H2]/deltat ? c) rate of delta[O2]/deltat ? 2. 2SO2(g)+O2(g)->2SO3(g) a) rate of delta[SO2]/deltat ? …
1. 2NO2(g)--->N2O4(g) Suppose 15.7g of NO2 is placed in a 15.0L container at a h
1. 2NO2(g)--->N2O4(g) Suppose 15.7g of NO2 is placed in a 15.0L container at a high temprature and the container was cooled to 22.0 degrees C. the total pressure is measured to…
1. 3) Given the following spontaneous reaction occurring in an electrochemical c
1. 3) Given the following spontaneous reaction occurring in an electrochemical cell under standard condition (25C, 1 atm, 1 mol/L) 3 Cl2(g) + 2 Fe(s) ? 6 Cl - (aq…
1. 3.000 grams of Ca is burned in a bomb calorimeter. The water’s temperature ro
1. 3.000 grams of Ca is burned in a bomb calorimeter. The water’s temperature rose from 20.0 degrees centigrade to 21.79 degrees centigrade. The heat capacity of the calorimeter i…
1. 3.000 grams of Ca is burned in a bomb calorimeter. The water’s temperature ro
1. 3.000 grams of Ca is burned in a bomb calorimeter. The water’s temperature rose from 20.0 degrees centigrade to 21.79 degrees centigrade. The heat capacity of the calorimeter i…
1. 33.32/50 points | Previous Answers My Notes Ask Your Teacher Part I: You are
1. 33.32/50 points | Previous Answers My Notes Ask Your Teacher Part I: You are instructed to produce solutions of HI and NaOH for your lab experiment. The concentration you shoul…
1. 33.32/50 points | Previous Answers My Notes Ask Your Teacher Part I: You are
1. 33.32/50 points | Previous Answers My Notes Ask Your Teacher Part I: You are instructed to produce solutions of HI and NaOH for your lab experiment. The concentration you shoul…
1. 36.7 kj/mol rxn for NaOH (s) = NaOH (aq) 2. -0.4311 kj/mol rxn for HCl(aq)+Na
1. 36.7 kj/mol rxn for NaOH (s) = NaOH (aq) 2. -0.4311 kj/mol rxn for HCl(aq)+NaOH(s) 3. -0.28 kj/mol rex for HCl (aq) +NaOH (aq) 4. -0.277 kj/mol rxn for CH3COOH(aq)+NaOH (aq) a.…
1. 4 o 0 o 1 o 3 o 2 o . 2. Each amino acid has two functional groups in common
1. 4o 0o 1o 3o 2o. 2. Each amino acid has two functional groups in common and one of 20 other groups attached to the ?–carbon. The two functional groups are alcohol and amine. est…
1. 4.569 x 10 ml to ul 2. How many milliliters (ml) is in 7.82 x 10L 3. 81.2g to
1. 4.569 x 10 ml to ul 2. How many milliliters (ml) is in 7.82 x 10L 3. 81.2g to ng 4. Match by drawing a line between th e PREFIX to the SYMBOL then match the SYMBOL to the MEANI…
1. 4Al( s ) + 3O 2 ( g ) 2Al 2 O 3 ( s ) A.1.986 × 10 3 kJ B.73.61 kJ C.147.2 kJ
1. 4Al(s) + 3O2(g) 2Al2O3(s) A.1.986 × 103 kJ B.73.61 kJ C.147.2 kJ D.36.80 kJ E.18.40 kJ 2. Which of the following statements is true concerning the decomposition of liquid water…
1. 5.21 cm is the same distance as A. 0.0521 m B. 52.1 dm C. 5.21 mm D. 0.00521
1. 5.21 cm is the same distance as A. 0.0521 m B. 52.1 dm C. 5.21 mm D. 0.00521 km E. 5210 m 2.The measurement 0.000 0043 m, expressed correctly using scientific notation, is A. 0…
1. 56.3 ml of 1.05 M hydrochloric acid is added to 25.1 ml of barium hydroxide,a
1. 56.3 ml of 1.05 M hydrochloric acid is added to 25.1 ml of barium hydroxide,and the resulting solution is found to be acidic. 15.5 ml of 2.76 M sodium hydroxide is required to …
1. 70 grams of CaCl2 is dissolved in water to give 500 mL of solution. Calculate
1. 70 grams of CaCl2 is dissolved in water to give 500 mL of solution. Calculate the Molarity of the solution 2. When the gases are at the same temperature 7 liters of H2 gas reac…
1. 75.0 mL of 1.45 M NaOH is neutralized by 93.7 mL of an HCl solution. What is
1. 75.0 mL of 1.45 M NaOH is neutralized by 93.7 mL of an HCl solution. What is the molarity of the HCl solution? (Show your work.) 2. A sample of helium gas occupies 1,021 mL at …
1. 9. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 1 3d 5 How many neutrons in the element depict
1. 9. 1s2 2s2 2p6 3s2 3p6 4s1 3d5 How many neutrons in the element depicted above? Answer: 2. 110. Choose the correct value for the total number of molecules in 5 g of sodium…
1. ?(2 point each) How many significant figures does each of the following numbe
1. ?(2 point each) How many significant figures does each of the following numbers have? ? a) 40.050?????_______________ ? b) 0.0340 x 105 ????_______________ …
1. A .50 - g sample of immunoglobulin G, a nonvolatile nonelectrolyte, is dissol
1. A .50 - g sample of immunoglobulin G, a nonvolatile nonelectrolyte, is dissolved in enough water to make .100 L of solution, and the osmotic pressure of the solution at 25 degr…
1. A .write a chemical equation which goes with the statement: i) K b = 4.3 X 10
1. A.write a chemical equation which goes with the statement: i) Kb= 4.3 X 10-10 for aniline (C6H5NH2) ii)Kb = 2.1 X 10-4 for carbonate ion B. Kb =1.3 X 10-3 for C5H11N and kb= 6.…
1. A 0.0450 M solution of benzoic acid has a pH of 2.71. Calculate pKa for this
1. A 0.0450 M solution of benzoic acid has a pH of 2.71. Calculate pKa for this acid. 2. A 0.0460 M solution of HA is 0.80% dissociated. Calculate pKa for this acid. 3. Consider a…
1. A 0.10 M solution of NaCH3COO has a pH of 8.8. Write the equilibrium equation
1. A 0.10 M solution of NaCH3COO has a pH of 8.8. Write the equilibrium equation and then calculate the Kb for the salt, NaCH3COO. Show your work. 2. The pH of a weak acid solutio…
1. A 0.100 M solution of an unknown acid, HA, is 3.54% ionized. Complete the fol
1. A 0.100 M solution of an unknown acid, HA, is 3.54% ionized. Complete the following ice table, but instead of using the variable x, calculate the number values of each quantity…
1. A 0.100 M solution of the weak acid HB has a pH of 3.00. What are the [H+], [
1. A 0.100 M solution of the weak acid HB has a pH of 3.00. What are the [H+], [B-], and Ka for this acid? 2. A solid acid is dissolved in water. Half the solution is titrated to …
1. A 0.100-mol sample of NO2 was placed in a 10.0-L container and heated to 750
1. A 0.100-mol sample of NO2 was placed in a 10.0-L container and heated to 750 K. The total pressure of the equilibrium mixture as a result of the decomposition 2NO2(g) 2NO(g) + …
1. A 0.14-g sample of a purified protein is dissolved in water to give 2.0 mL of
1. A 0.14-g sample of a purified protein is dissolved in water to give 2.0 mL of solution. The osmotic pressure is found to be 17.2 torr at 25°C. Calculate the protein's molar mas…
1. A 0.17-mole sample of nitrogen gas occupies a volume of 2.80 L . What is the
1. A 0.17-mole sample of nitrogen gas occupies a volume of 2.80 L . What is the volume of 0.29 mol of nitrogen gas under the same conditions? Express your answer using two signifi…
1. A 0.4243-g sample of CaCO 3 is dissolved in 12 M HCI and the resulting soluti
1. A 0.4243-g sample of CaCO 3 is dissolved in 12 M HCI and the resulting solution is diluted to 250.0 mL in a volumetric flask. a) how many moles of the CaCO 3 are used (formula …
1. A 0.516 g portion of a sample that contains sodium oxalate is dissolved in wa
1. A 0.516 g portion of a sample that contains sodium oxalate is dissolved in water to which sulfuric acid has been added. The end point of the titration of the solution with 0.02…
1. A 0.5188g sample of CaCO3 is dissolved in 6M HCl and the resulting solution i
1. A 0.5188g sample of CaCO3 is dissolved in 6M HCl and the resulting solution is diluted to 250.0mL in a volumetric flask. (a)How many moles of CaCO3 are in the sample? (formula …
1. A 0.875 g sample of an unknown acid requires 32.1mL of a 0.182M barium hydrox
1. A 0.875 g sample of an unknown acid requires 32.1mL of a 0.182M barium hydroxide solution for neutralization. Assuming the acid is diprotic, calculate the molar mass of the aci…
1. A 0.897g sample containing chloride ion is treated with excess lead (II) nitr
1. A 0.897g sample containing chloride ion is treated with excess lead (II) nitrate. The lead (II) chloride precipitated is filtered into a filter paper that weighed 0.923g. Af…
1. A 0.9132-gram sample of iron ore is dissolved in aqueous hydrochloric acid. I
1. A 0.9132-gram sample of iron ore is dissolved in aqueous hydrochloric acid. It dissolves completely and in the process, all of the iron goes into solution as Fe2+ ion. The foll…
1. A 07121 g sample of a wheat flour was analyzed by Kjeldahl method. The ammoni
1. A 07121 g sample of a wheat flour was analyzed by Kjeldahl method. The ammonia formed by addition of concentrated base after digestion with 112504 was distilled into 25.00 mL o…
1. A 1.37 grams antacid tablet is added to 25.00 mL of 0.450 M HCl. After the re
1. A 1.37 grams antacid tablet is added to 25.00 mL of 0.450 M HCl. After the resulting reaction was complete, back titration required 10.4 mL of 0.1212 M NaOH. Assuming that the …
1. A 10.0-mL solution ofH2SO4(aq) solution is titrated with 0.254 M NaOH(aq). Th
1. A 10.0-mL solution ofH2SO4(aq) solution is titrated with 0.254 M NaOH(aq). Theequivalence point of the titration is 47.35mL. a. What is the molarconcentration of th…
1. A 10.00 mL aliquot of 0.010 M CaCO3 is titrated with 18.22 mL of EDTA solutio
1. A 10.00 mL aliquot of 0.010 M CaCO3 is titrated with 18.22 mL of EDTA solution. What is the EDTA molarity? 2. A 250.0 mL water sample requires 30.85 mL of the EDTA solution fro…
1. A 10.00 mL aliquot of 0.010 M CaCO3 is titrated with 18.22 mL of EDTA solutio
1. A 10.00 mL aliquot of 0.010 M CaCO3 is titrated with 18.22 mL of EDTA solution. What is the EDTA molarity? 2. A 250.0 mL water sample requires 30.85 mL of the EDTA solution fro…
1. A 10.00 mL portion of acetic acid was added to an Erlenmeyer flask with a pip
1. A 10.00 mL portion of acetic acid was added to an Erlenmeyer flask with a pipette and titrated to the end point with 16.30 mL of 0.1087 M NaOH(ag). Flo a. Write the balanced ch…
1. A 100-watt lightbulb radiates energy at a rate of 100 J/s (The watt, a unit o
1. A 100-watt lightbulb radiates energy at a rate of 100 J/s (The watt, a unit of power, or energy over time, is defined as 1 J/s.) If all of the light emitted has a wavelength of…
1. A 100-watt lightbulb radiates energy at a rate of 100 J/s (The watt, a unit o
1. A 100-watt lightbulb radiates energy at a rate of 100 J/s (The watt, a unit of power, or energy over time, is defined as 1 J/s). If all of the light emitted has a wavelength of…
1. A 100. mL solution of 0.35 mol of Ca 2+ (aq) was mixed with 0.50 mol of F - (
1. A 100. mL solution of 0.35 mol of Ca2+ (aq) was mixed with 0.50 mol of F-(aq) ions, and CaF2 was percipitated: The temperature of the solution increased by 10.5 Celcius. What w…
1. A 150-W heater was placed in 1.00 kg of methanol and turned on for exactly 1
1. A 150-W heater was placed in 1.00 kg of methanol and turned on for exactly 1 min. The temperature increased by 3.54 C. Assuming that all the heat is absorbed by the methanol, c…
1. A 1500 kg mix having 15% salt is fed in an evaporator. A total of 500 kg of c
1. A 1500 kg mix having 15% salt is fed in an evaporator. A total of 500 kg of concentrate remained. Determine the weight of water removed and the composition of the concentrate. …
1. A 1500 kg mix having 15% salt is fed in an evaporator. A total of 500 kg of c
1. A 1500 kg mix having 15% salt is fed in an evaporator. A total of 500 kg of concentrate remained. Determine the weight of water removed and the composition of the concentrate. …
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