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Suppose you burn exactly 1500 g of benzoic acid, C6H5CO2H, in a combustion calorimeter and find that the temperature of the calorimeter increases from 22.50 to 31.69°C.
Based only on a comparison of their impaction numbers, what will be the ratio of particles collected (5 micrometer to 1 micrometer)? Show work.
A cube of solid benzene (C6H6) at its melting point and weighing 8.37 g is placed in 19.3 g of water at 38.8 °C. Given that the heat of fusion of benzene is 9.92 kJ/mol, to what temperature will
Calculate the terminal settling velocity in standard air for the following particles: a. diameter = 10 micrometers, specific gravity =1.2; and b. diameter = 4 micrometers, specific gravity = 2.0. Sh
An unknown solid salt is dissolved in water to form a solution. Describe one chemical and one physical way that the salt could be separated from the water.
Excess aqueous NaI was added to 50ml of aqueous CuNO3 solution, and 19.81g of CuI precipitate was formed. What was the molar concentration of CuNO3 in the original solution in units of mols?
What is the maximum (threshold) wavelength of the gamma-ray in nm (nanometers) in 207Pb(gamma,n) reaction, that will permit the reaction to occur?
A student titrates 25.0 mL of HCl using a standard solution of 0.250 M NaOH. What is the molarity of the HCl solution is it takes 35.0 mL of NaOH to reach the titration endpoint? What is the mass o
Here are the enthalpy changes when one mole of HCl gas is added to various moles of water: -16.608 Kcal for 10 mol, -17.272 Kcal for 25 mol, -17.453 Kcal for 40 mol, -17.735 Kcal for 200 mol, -17.96
How many cubic meters of ore at an average density of 2.8 g/cm3 had to be excavated to provide the uranium if the ore grade was 0.8 w/o?
Dr. Brown's new house will need to use propane (C3H8) gas to fuel the range, because natural gas service is not available at the location. The propane is stored as a liquid, and the gas to be burned
Compare the relative translational, vibrational, and rotational contributions to heat capacity for gaseous water and sulfur hexaflouride at a fixed temperature.
Calculate the standard free energy change in kJ between Br2 and Cl- to form Br- and Cl2 when all components of the reaction are at standard state conditions.
Freon-12, CF2Cl2, which has been widely used in air conditioning systems, is considered a threat to the ozone layer in the stratosphere. Calculate the root-mean-square speed of Freon-12 molecules in
What is the pressure of the gas trapped in the closed end of the apparatus shown (the other end is open to the air) when the atmospheric pressure is 720 mmHg? The Hg level in the closed end is 12 m
A reference standard prepared by dissolving 5.4 mg of a transition metal coordination compound in 40 mL of water transmits 36.3 percent of incident light at 532 nm.
If the specific heat of water is 4.18 J/g x Celsius for a mass of 125 g of water which increased in temperature by .121 Celsius when 2.4 x 10^-4 g of sodium hydroxide (NaoH) was dissolved, what was
Give a complete analysis of the following data collected for the % of sulfate in a sample: 17.26%, 17.48%, 18.85%, 16.88%, 15.74%, 17.68%.
What should be the concentration of the sodium thiosulfate solution in order that each mL of the solution correspond to exactly 10 mg of the hydrogen peroxide solution?
What is the magnitude and sign of the molar heat of vaporization of butane? Explain your reasoning using Hess's Law. is your sign for the heat of vaporization realistic? Explain.
The difference in pathlength traveled by the incoming and outgoing rays from a diffraction grating is 750 nm. If there was third order diffraction, at what wavelength would constructive interferenc
A galvanic cell (Zn/Zn2+ // Zn2+/Zn) was connected to a DC power supply with Current of 1.25 x 10^-2 A for 1.15 hours. Calculate how many mg Zn will attach to the cathode theoretically?
When selecting the appropriate wavelength and bandwidth for a spectrophotometric analysis, the bandwidth should be as large as possible but small compared with the band being measured. Why?
A 10.0Kg sample of benzene treated with excess chlorine gas yields 10.4 Kg of Chlorobenzene. Calculate the percent yield of Chlorobenzene.
The calorimeter has a heat capacity of 18.5J/degrees celcius, the water has a specific heat of 4.184J/g, and the iron has a specific heat of 0.444J/g What is the final temperature observed?