Chemistry concepts and calculations

1(a) (15 points) A 0.3600-g mixture of oxalic acid (H2C204, diprotic) and benzoi

1(a) (15 points) A 0.3600-g mixture of oxalic acid (H2C204, diprotic) and benzoic acid (CeHsCOOH, mono- protic) is dissolved in water and then treated with an excess of 0.1000 M N…

1(a) Give the oxidation numbers for the underlined atoms for each of the followi

1(a) Give the oxidation numbers for the underlined atoms for each of the following: (i) ClO- (ii) OF2 …

1(a)-Complete and balance the following redox equation thatoccurs in acidic solu

1(a)-Complete and balance the following redox equation thatoccurs in acidic solution using the set of smallest whole-numbercoefficients. What is the sum of all the coefficients in…

1) #include int main(void) { const int NUM_VALS = 4; int origList[NUM_

1) #include <stdio.h> int main(void) { const int NUM_VALS = 4; int origList[NUM_VALS]; int offsetAmount[NUM_VALS]; int i = 0; origList[0] = 40; origList[1] = 50; origList[2]…

1) (32 pts) Ethanol is in a closed tank and the level indicator has broken. Your

1) (32 pts) Ethanol is in a closed tank and the level indicator has broken. Your boss requests that you determine the height (and therefore the volume) of the ethanol in the tank …

1) (3pts) Identify the ions present in Na2SO4 a. Na*, S2, and O2 b. Na, s2, and

1) (3pts) Identify the ions present in Na2SO4 a. Na*, S2, and O2 b. Na, s2, and o2 c. Nat and SO4 d. Na, S2, and O e. Na and SO4 203 pts) which element is most likely to form a 2-…

1) (4 pts) The following data summarize experiments on unknown substances, code

1) (4 pts) The following data summarize experiments on unknown substances, code named A, B, and C. 100.0 g of A at 75.0 °C was put in thermal contact with 100.0 g of B at 25.0 °C.…

1) (4 pts) The following data summarize experiments on unknown substances, code

1) (4 pts) The following data summarize experiments on unknown substances, code named A, B, and C. 100.0 g of A at 75.0 °C was put in thermal contact with 100.0 g of B at 25.0 °C.…

1) (5 pts) A mole of benzene (C,H. with an initial temperature of 0.0°C is place

1) (5 pts) A mole of benzene (C,H. with an initial temperature of 0.0°C is placed in contact with a heat bath (the surroundings) at 100rc. Calculate }, s, as, . AH, r, as r. AH ,,…

1) (5 pts) A mole of benzene (C,H. with an initial temperature of 0.0°C is place

1) (5 pts) A mole of benzene (C,H. with an initial temperature of 0.0°C is placed in contact with a heat bath (the surroundings) at 100rc. Calculate }, s, as, . AH, r, as r. AH ,,…

1) (9 pts.): Find the detailed technical specifications for a commercial hard dr

1) (9 pts.): Find the detailed technical specifications for a commercial hard drive. The specifications will identify a precise minimum or total amount of storage provided on the …

1) (a)Which will have greater absorbance as measured by a spectrometer: weak ice

1) (a)Which will have greater absorbance as measured by a spectrometer: weak ice tea or strong ice tea? (b)Which will have a greater transmittance?(Hint: see the Appendix) 2) Why …

1) +4634.9 kJ/mol-rxn –371.2 kJ/mol-rxn –215.4 kJ/mol-rxn +371.2 kJ/mol-rxn –320

1) +4634.9 kJ/mol-rxn –371.2 kJ/mol-rxn –215.4 kJ/mol-rxn +371.2 kJ/mol-rxn –320.6 kJ/mol-rxn --------------- 2) QUESTION 15 What is ?rG° at 500.0 K for the following reaction? Zn…

1) - Scientists performed an experiment to determine whether there is a connecti

1) - Scientists performed an experiment to determine whether there is a connection between learning ability and food. They took two groups of 20 mice each, all from the same pureb…

1) 0.121 grams of oxalic acid dihydrate (MW=126.068 g/mole) is dissolved in wate

1) 0.121 grams of oxalic acid dihydrate (MW=126.068 g/mole) is dissolved in water in an Erlenmeyer flask. Remember that each mole of oxalic acid dissolved in water results in 2 mo…

1) 0.121 grams of oxalic acid dihydrate (MW=126.068 g/mole) is dissolved in wate

1) 0.121 grams of oxalic acid dihydrate (MW=126.068 g/mole) is dissolved in water in an Erlenmeyer flask. Remember that each mole of oxalic acid dissolved in water results in 2 mo…

1) 0.3 moles sodium hydroxide (HO- Na+) are mixed with 1.8 moles of formic acid

1) 0.3 moles sodium hydroxide (HO- Na+) are mixed with 1.8 moles of formic acid (HCOOH). What is the pH of the resulting solution? The pKa of formic acid is 3.75 (2 decimal place…

1) 0.50 mol of an ideal gas is expand isothermally against constant pressure of

1) 0.50 mol of an ideal gas is expand isothermally against constant pressure of 2.0 atm from 1.0 L to 5.0 L . After expansion, the gas is in equilibrium with its surrounding . Cal…

1) 0.830 g of an unknown metal is reacted with excess concentrated hydrochloric

1) 0.830 g of an unknown metal is reacted with excess concentrated hydrochloric acid according to the reaction below. 0.355 L of hydrogen gas was collected over water on a day whe…

1) 0.90 g of hydrogen chloride ( H C l ) is dissolved in water to make 2.5 L of

1) 0.90g of hydrogen chloride (HCl) is dissolved in water to make 2.5L of solution. What is the pH of the resulting hyd…

1) 1) Energy is generated as a result of the difference in hydrogen ion concentr

1) 1) Energy is generated as a result of the difference in hydrogen ion concentration between the intermembrane space and the cytoplasm. 2) The pH in the intermembrane space is hi…

1) 1-chloroadamantane is a tertiary halide, yet it is 10,000 times slower than t

1) 1-chloroadamantane is a tertiary halide, yet it is 10,000 times slower than tert-butyl chloride when allowed to react with silver nitrate in ethanol. EXPLAIN WHY 2) Are alkyl f…

1) 1. How many ATOMS of sulfur are present in 4.30 moles of sulfur dioxide ? ato

1) 1. How many ATOMS of sulfur are present in 4.30 moles of sulfur dioxide ? atoms of sulfur. 2. How many MOLES of oxygen are present in 1.91×1022 molecules of sulfur dioxide ? mo…

1) 1.0 mol of an ideal gas is compressed isothermally from 2.0 atm and 2.0L to 4

1) 1.0 mol of an ideal gas is compressed isothermally from 2.0 atm and 2.0L to 4.0atm and 1.0 L? Calculate the values of dU and dH if the process is done a) reversibly and b) irre…

1) 1.027 g of an unknown hydrocarbon (98.1 g/mol) burns in bomb calorimeter in e

1) 1.027 g of an unknown hydrocarbon (98.1 g/mol) burns in bomb calorimeter in excess oxygen. The heat capacity of the calorimeter,Cv, = 5.270 kJ/ºC and T =7.778 ºC. Find E for th…

1) 1.64 mol of nickel at 150.13C is placed in 1.00 L of water at 25.09C. The fin

1) 1.64 mol of nickel at 150.13C is placed in 1.00 L of water at 25.09C. The final temperature of the nickel-water mixture is 26.34C. what is the specific heat of nicker? a)0.349 …

1) 1.75g of an unknown gas at 31°C and 1.05 atm is stores in a 2.55-L flask. - W

1) 1.75g of an unknown gas at 31°C and 1.05 atm is stores in a 2.55-L flask. - What is the density of the gas? ______ g/L - What is the molar mass of the gas? _____ g/mol 2) If th…

1) 1.95 moles of HBr in 250.0 mL flask is consumed in 1.00 minutes in the gas ph

1) 1.95 moles of HBr in 250.0 mL flask is consumed in 1.00 minutes in the gas phase reaction 2 HBr(g) H2(g) + Br2(g) at 150°C. The rate of reaction is __________ Ms-1. 3.85 0.06…

1) 10 mL of a sample was diluted with 30 mL of solvent and the transmittance mea

1) 10 mL of a sample was diluted with 30 mL of solvent and the transmittance measured to be 40% at 450 nm in a 2.25 cm cell. Using a molar absorptivity constant of 3285 L mol-1 cm…

1) 130 I decays by emission of beta particles to form stable 130 Xe. A 3.00 g io

1)130I decays by emission of beta particles to form stable 130Xe. A 3.00 g iodine sample containing some I-130 was recorded as having 9010 disintegrations per min. k = 0.00094 min…

1) 1b)If you wanted to gather evidence to support this mechanism you would a)Att

1) 1b)If you wanted to gather evidence to support this mechanism you would a)Attempt the reaction at a higher temperature and observe if the rate is faster. b)attempt to show that…

1) 2) 3) 4) 5) Assuming that the smallest measurable wavelength in an experiment

1) 2) 3) 4) 5) Assuming that the smallest measurable wavelength in an experiment is 0.610 fm (femtometers), what is the maximum mass of an object traveling at 339 m . s^-1 for whi…

1) 2) 3) An adiabatic process is one that involves no heat transfer. What is the

1) 2) 3) An adiabatic process is one that involves no heat transfer. What is the relationship between work and internal energy in an adiabatic process? What is the change in inter…

1) 2) 3) An adiabatic process is one that involves no heat transfer. What is the

1) 2) 3) An adiabatic process is one that involves no heat transfer. What is the relationship between work and internal energy in an adiabatic process? What is the change in inter…

1) 2) Can you please help? a group 4A The addition of a dopant atom (group 3A el

1) 2) Can you please help? a group 4A The addition of a dopant atom (group 3A element) that has fewer v in a semiconductor. The addition of a dopant atom (group 5A elements) that …

1) 2) What pressure (relative to its original pressure) would be required to red

1) 2) What pressure (relative to its original pressure) would be required to reduce the volume of a gas to one third its original volume? Use the volume and pressure with the idea…

1) 2) Which of the following carbocations will be the most stable and most likel

1) 2) Which of the following carbocations will be the most stable and most likely carbocation formed during the solvolysis of 1-chloro-2-methylcyclohexane in CH3OH? 3)Which of the…

1) 20 kg/min water at 20º C is mixed adiabatically with 40 kg/min water at 80 ºC

1) 20 kg/min water at 20º C is mixed adiabatically with 40 kg/min water at 80 ºC. What is the outlet water temperature? Select one: a. 80 °C b. 60 °C c. 50 °C d. 70 °C 2) Steam at…

1) 28.92mL of NaOH are required to titrate .5982 g of KHP to the phenolphthalein

1) 28.92mL of NaOH are required to titrate .5982 g of KHP to the phenolphthalein endpoint. 22.41mL of the same NaOH solution are needed to titrate 25.00mL of the HCL solution to t…

1) 2A B + C Two trials of the above reaction are run with the same initial conce

1) 2A B + C Two trials of the above reaction are run with the same initial concentration of A. The first trial is performed at 25oC and the second at 35oC. If the rate constant at…

1) 2A B + C Two trials of the above reaction are run. The concentration of A in

1) 2A B + C Two trials of the above reaction are run. The concentration of A in the second trial is three times that in the first. It is found that the initial rate of the reactio…

1) 2C8H18 ( g ) +25O2 ( g ) 16CO2 ( g ) +18H2O ( g ) A)After the reaction, how m

1) 2C8H18(g)+25O2(g)16CO2(g)+18H2O(g) A)After the reaction, how much octane is left? 2)The Haber-Bosch process is a very important industrial process. In the Haber-Bosch process, …

1) 2Fe(s)+3Cl2(g)--> 2FeCl3(s) ?H= -687.6 kJ and ?S= -440.3 J/k at 253 K and 1 a

1) 2Fe(s)+3Cl2(g)--> 2FeCl3(s) ?H= -687.6 kJ and ?S= -440.3 J/k at 253 K and 1 atm The standard enthalpy change for the reaction of 1.55 moles of Fe (s) at this temperature wou…

1) 3.00 g of p-aminophenol is reacted with 5.0 mL of acetic anhydride (density-

1) 3.00 g of p-aminophenol is reacted with 5.0 mL of acetic anhydride (density- 1.08 g/mL) to form acetaminophen and acetic acid as per the reaction below. What is the theoretical…

1) 362.11 g of O2 are contained in a 3.00 L high pressure tank at a temperature

1) 362.11 g of O2 are contained in a 3.00 L high pressure tank at a temperature of 186°C. What is the pressure of the gas in torr? 2) A gas has a given volume. The moles of gas ar…

1) 4 drops of 6M HCl solution are added to the unknown solution and no precipita

1) 4 drops of 6M HCl solution are added to the unknown solution and no precipitate 2) The pH of the solution from (1) is raised to 9.5 by the addition of 6M NH3 solution. A cloudy…

1) 4-Nitrophenol has a pKa of 7.16. 3-Chlorobenzoic acid has a pKa of 3.82. p-Cr

1) 4-Nitrophenol has a pKa of 7.16. 3-Chlorobenzoic acid has a pKa of 3.82. p-Cresol has a pKa of 10.26. You will need the following information: The pKa of HCl is –7; pKa of carb…

1) 50 litres of a gas at 0 degrees celsuis are heated to 127degrees celsuis. Wha

1) 50 litres of a gas at 0 degrees celsuis are heated to 127degrees celsuis. What is the final volume? The pressure remainsconstant. 2) calculate the density of CO2 gas at STP (in…

1) 56.0 mL of 3.80 M sodium hydroxide is combined with 42.0 mL of 1.00 M magnesi

1) 56.0 mL of 3.80 M sodium hydroxide is combined with 42.0 mL of 1.00 M magnesium chloride. What mass in grams of solid forms? 2) Sodium thiosulfate, Na2S2O3, is used as a fixer …

1) 70.0 grams of Gold at 100.0 °C is added to 20.0 grams of water at 20.0°C in a

1) 70.0 grams of Gold at 100.0 °C is added to 20.0 grams of water at 20.0°C in an insulated container. The final temparature of he mixture is 33.0 °C. The specific heat of water i…

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