QUESTION 1 Imagine that you are in chemistry lab and need to make 1.00L of a solution with a pH of 2.50. You have in front of you: - 100mL of 7.00x10-2 M HCl - 100mL of 5.00x10-2 M NaOH, and - Plenty of distilled water. You start to add HCl to a beaker of water when someone asks you a question. When you return t
To do this assignment, use your calculator to do the calculations required. Then invert the calculator to read the message word. Insert the message word into the appropriate space in the statement. Round off all atomic masses to the nearest whole number before using them. When handing in your assignment, be sure to show all
At low to moderate pressures, the equilibrium state of the water gas shift CO (g) + H2O (g) CO2 (g) + H2 (g) reaction is approximately described by the relation kp = (see attached file) The feed to a continuous shift reactor contains 30 mol% CO, 10 mol% CO2, 40 mol% water and the balance an inert gas. Th
The purpose of lab this week is to do "comfirmatory experiments" that further explore the properties of your unknown compound and confirm that it reacts appropriately for the compound you predicted it to be at the end of lab last week. 1. Suppose your unknown is sodium acetate. When a solution of calcium chloride is adde
Please help with the following physical chemistry problem: Alcoholic fermentation by microorganisms involves the breakdown of glucose into ethanol and carbon dioxide. C6H12O6 (s) -->; 2 C2H5OH (l) + 2 CO2 (g) a) Calculate the amount of heat liberated in a yeast brew upon fermentation of 1 mol of glucose at 25 °C and 1
Part A. Standardization of the 0.02 M KMnO4 solution with Fe(NH4)2(SO4)2 ? 6H2O. (Molecular weight of the ferrous sulfate hexahydrate is 392.16 g/mol). If you weigh out 1.01 g of the Fe(NH4)2(SO4)2 ? 6H2O, how many moles of iron (Fe+2) are in the sample? Part B Assume you fill a buret with your KMnO4 solution and the v
In this introduction are given the explanation of how to find out an empirical formula if one has found out the chemical elements of an unknown substance and measured their ratio of masses. Also, it is described how one can calculate the ratio of masses from a given empirical formula. Two examples and the explanation of the pri
Please help with the following problem. Provide step by step calculations in this answer. A 25.00 mL sample containing Cu2+ gave an instrument signal of 23.6 units (corrected for a blank). When exactly 0.500 mL of 0.0287 M Cu(NO3)2 was added to this solution, the signal increased to 37.9 units. Calculate the molar concentrat
The molar heat capacity of C6H6(l) is 136 J/mol x degrees centigrade and of C6H6 (g) is 81.6 J/mol x degrees centigrade. The molar heat of fusion for benzene is 9.92 kJ/mol and its molar heat of vaporization is 30.8 kJ/mole. The melting point of benzene is 5.5 degrees centigrade, its boiling point is 80.1 degrees centigrade and
Determine the strength of 5 antacids via addition to a known amount of acid, followed by titration with base. Determine which is most effective per dose and per gram.
Imagine yourself as the Lead Analytical Chemist at Kaplan Industries. Your first big assignment is to investigate the strength of several commercial antacids for the Food and Drug Administration (FDA). They have sent five antacids to be tested with a back-titration that works as follows: ? First, each antacid tablet is mixed w
1.Given the molar concentration of hydrogen ion [H+] = 6.2 x 10 -7, calculate the concentration of hydroxide ion. 2.Given the molar concentration of hydroxide ion [OH -] = 4.6 X 10 -13, calculate the concentration of hydrogen ion. 3. In 1 mL of water there are 3 X 1022 molecules of H2O. How many hydrogen ions are in 1 mL o
16. A compound contains 40.00% carbon, 6.67% hydrogen, and 53.33% oxygen. Determine the empirical formula of the compound. Please help with the following problems. 1. Give the chemical formula for calcium phosphate. 2. A hypothetical element, Js, has three naturally occurring isotopes. The atomic mass and relative abunda
What is the pressure in atmospheres of 201 grams of O2 gas in a 12.0 liter vessel at 25.0OC?
4.) Determine the concentrations of hydronium and hydroxide ions in 0.0403 M aqueous sodium hydroxide. Kw = 1.0E-14. A.) Hydronium ion concentration?(answer in M) B.) Hydroxide ion concentration?(answer in M) 6.) Concentrated aqueous HClO4 has a concentration of 14.8 M. Calculate the concentrations of all ions present in a
The gasoline storage tank is filled to 12m and the closed space above is filled with nitrogen gas N2. For the condiction shown (see attachment) determine : a) Pressure of nitrogen gas b) Density of gasoline c) Force on the tank bottom d) Force on the flat door e) Minimum force to hold door closed
1. a volume of 20 cu ft of air at pressure of 50 psig is heated and expanded to 30 cu ft and 40psig find the change in the energy of air in joules. (A)35564 j (B) 48219 j (C)123378 j (d)167278j 2>A quantity of gas equal to 35 cu ft is to be expanded adiabatically.It has specific heat at constant pressure of 0.532 and
A sample of nitrogen gas has a volume of 3.00 L at 25 degrees C. What volume will it occupy at each of the following temperatures if the pressure and number of moles are constant: a) 546K b) 273K c) 373K
A 0.213-g sample of uranyl(VI)nitrate, UO2(NO3)2, is dissolved in 20.0 mL of 1.0 M H2SO4 and shaken with Zn. The zinc reduces the uranyl ion, UO2 (with a charge of 2+), to a uranium ion, Un+ (where n+ is the charge of the uranium ion). To determine the value of n, this solution is titrated with KMnO4. Permanganate is reduced to
Please see the attached file. 2. Balance this equation using no fractional coefficients H2O + CrO4^2- + HSnO2- ---> HSNO3- + CrO2- + OH- 3. Balance this equation using no fractional coefficients MnO4- + H2O2 + H+ --> Mn2+ + O2 + H2O 4. Which is an acid according to Lewis, but not according to Bronsted? OH- O2- CO2
I am working on a Chemistry lab write up and I have to determine the pressure of the dry butane gas. My Data Table: initial mass of lighter= 21.03g volume of gas collected= 93.6 mL temperature of the water= 23.2 degrees C barometric pressure= 1.012 atm final mass of lighter= 20.820 therefore the mass of butane collec
If you have an electrolyte solution in which you have inserted an electrode to charge it either positive or negative - and then you remove the electrode - is it possible to then magnetize this solution by any one or several methods?
22. How many grams of potassium permanganate, KMnO4, are required to make 2.00X10^2cm^3of a 1.50M solution? 27. What is the concentration of a solution that contains 90.3g of MgSO4 in 5.00 x10^2cm^3?
Phosgene, COCl2 (g), is an extremely toxic gas. It was used during World War I. Today it is used to manufacture pesticides, pharmaceuticals, dyes, and polymers. It is prepared by mixing carbon monoxide and chlorine gas. CO (g) + Cl2 (g) = COCl2 (g) <-- the equal sign should be the sign for foward and reversible
Please see the attached file.
1) How many milliliters of 0.480M NaOH would be required to titrate a 5.00ml solution of 0.320M H2SO4? Report answer to the correct number of significant figures. 2) Write a balanced equation for the combustion of octane, C8H18. 3) If the standard enthalpy of formation (deltaHf) of methanol, CH3OH, is -238.6kJ/mol, deltaHf(CO
Explain qualitatively how the following would change the calculated surface concentration of SO2 assuming a gaussian plume from a smoke stack that follows the gaussian equation for the concentration of SO2 i) The wind speed decreased. ii) The wind speed increased. iii) A stable temperature profile became unstable. iv) An
Write the reactions responsible for the LIQUID PHASE oxidation of S(IV) to S(VI), and show how the oxidation can lead to a decrease in pH of rain water. I think you can help me with this. Please let me know. I've included all details.Thank you Dr. M. There are two sets of reactions with 3 parts for each set. I'm not sure w
Weight of zinc in pounds contained in 936,000 yds3 of zinc hydroxide (Zn(OH)2) with an average concentration of 200,000 mg/Kg.
I need the weight of zinc in pounds contained in 936,000 yds3 of zinc hydroxide (Zn(OH)2) with an average concentration of 200,000 mg/Kg.
Some backround data: mass of NiCl2 + 6H2O = 3g mass of Ethylenediamine used: 2.85g initial moles ethylenediamine: .0474 (I think) product formed: mass of Ni(C_2_H_8_N_2_)_3_CL_2_: 3.597 The questions I need answered: -theoretical moles of product, based on stoichiometry. -molecular mass of product -theoretical mass o
Diagram and explain the H-Bonds if they exist for the following molecules: (a.)H2S, (b.)CH4, (c.)H2SO3, and (d) PH3. Give reasons for the fact that ionic solids as NaCl have high melting points and dissolve readily in water, whereas network solids such as diamond have very high melting points and do not dissolve in water.