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In a coffee-cup calorimeter, 1.30 g of NH4NO3 is mixed with 74.0 g of water at an initial temperature of 25.00°C. After dissolution of the salt, the final temperature of the calorimeter contents
If a saturated solution of NH4NO3 at 75 °C is cooled to 15 °C, how many grams of solute will separate if the quantity of the solvent is 129 g.
One of the lines in the emission spectrum of sodium has a wavelength of 590 nm. What is the frequency of this line?
The density of germanium is 5.325 g/cm3. If you made a 5-nm diameter quantum dot of germanium, how many Ge atoms would it contain? Assume the dot is spherical.
A 0.0560 g quantity of acetic acid is dissolved in enough water to make 50.0 mL of solution. Calculate the concentration of H+, CH3COO-, and CH3COOH at equilibrium. Ka for acetic acid= 1.8x10^-5
0.035M O2(g) AND end with 0.012M NO2, what is the equilibrium constant for this reaction and what are the equilibrium concentrations for NO and O2?
What is the theoretical yield of bismuth when 393 g of Bi2O3 reacts with excess carbon as shown below?
a tank containih 115 moles if neon gas it has a pressure of 57 atm at a temperature of 45 celsius. calculate the volume of the tank.
In a titration experiment, a 12.5 mL sample of 0.0500 M KOH neutralized 14.7 mL of HNO3 solution. Calculate the molarity of the HNO3 solution.
The volume of a drop of rain was found to be 0.448 ml at N.T.P. How many molecules of water and number of atoms of hydrogen are present in this drop?
Which of the following statements describes KCl (aq)?
Suppose that 1.02 of rubbing alcohol evaporates from a 70.0 aluminum block. If the aluminum block is initially at 25, what is the final temperature of the block after the evaporation of the alcohol?
If the amount of radioactive Iodine-123 in a sample decreases from 0.4g to 0.1g in 26.4 hours, what is the half- life, in hours of iodine-123.
What will happen to the membrane potential if the membrane suddenly becomes selectively permeable to K+ (but not Cl-)? What happens if you then add NaCl to one side only?
Arrange these hydrates in order of increasing percent water content. (Use the appropriate <, =, or > symbol to separate substances in the list. Compose the list using the appropriate formulas.
What mass of sucrose should be combined with 550 g of water to make a solution with an osmotic pressure of 8.65 atm at 295 K? (Assume the density of the solution to be equal to the density of the so
It is placed into a container of water at 17C. What mass of water was in the container? The specific heat of water is 4.184j/g C and of silver is 0.24J/gC.
Calculate the mass percent of a solution that is prepared by adding 72.6 g of NaOH to 418 g of H2O.
A student in a research lab tells you that she has isolated a protein that she thinks binds to DNA. Why is the student surprised?
Evaluate the average kinetic and potential energies, <Ekinetic> and <Epotential> , for the ground state (n=0) of the harmonic oscillator by carrying out the appropriate integration.
3.5 g of a hydrocarbon fuel is burned in a vessel that contains 250. grams of water initially at 25.00 C. After the combustion, the temperature of the water is 26.55 C. How much heat is evolved per
You have a sample that includes equimolar amounts of protein, dsDNA, ssDNA and typical eukaryotic mRNA. Briefly describe the sequence of steps that you would take using a diagram. Must have diagram.
System conducts 1.30x10^2 cal heat to srroundings while delivering 316 cal work. What is the change in internal energy of the system (in Cal)?
Three gases, hydrogen, helium, and krypton are confined in a 10.0 L vessel at a pressure of 6.00 atm. The vessel contains 4.00 moles of hydrogen, 3.00 moles of helium, and 5.00 moles of krypton. Wh
Calculate the pH of 0.45 M K2CO3. What are the concentrations of HCO3-, and H2CO3 in the solution? H2CO3 is a diprotic acid with Ka1 = 4.3 x 10-7 and Ka2 = 4.7 x 10-11.