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Someday, cars may be powered by clean H2/O2 fuel cells and electric motors. Under standard conditions, such a fuel cell can develop 1.229 volts. If the oxygen is obtained from air (at P=0.21 bar), w
Two point charges 2.0cm apart have an electric potential energy -400?J . The total charge is 25nC, What is the lesser and larger charge
What is its fate as cooling occurs? To help address the question, calculate the equilibrium constant at 298 K and 1300 K for each reaction: ½ O2(g) + NO(g) ? NO2(g)2 NO2(g) ? N2O4(g)
An infinite plane of surface charge density +.2uC/m^2 is in the y-z plane at x=0, What is the magnitude of the electric field close to the surface
Consider the chemical bonds found in the white solid, potassium hydrogen phosphate, K2HPO4. For each bond specified, choose the best description from the list of types below.
A parallel-plate capacitor is constructed with circular plates of radius 6.0×10?2m . The plates are separated by 0.26mm, Find the value of the dielectric constant
For the next three problems, consider 1.0 L of a solution which is 0.6 M NH4Cl and 0.2 M NH3 (Ka for NH4Cl = 5.6 x 10-10). Assume 2 significant figures in all of the given concentrations so that you
The PF5 molecule is known to have a trigonal bipyramidal shape. Explanation of its bonding includes all of the following EXCEPT: A. Bond Angles of 90 degrees
A rocket starts from rest and moves upward from the surface of the earth, What is the speed of the rocket when it is 340m above the surface of the earth
If 100 grams of liquid water at 100 C and 200 grams of water at 20 C are mixed in an insulated container, what will be the final temperature of water
what is the equilibrium concentration of C2H5OH? Help me work this please. My book shows answer of 27. However, I worked it and got 2.7
We wish to maintain a pattern with a given number of loops and a fixed given frequency, If we reduce the density of the string
what is the solubility of N2 in a diver's blood?[Use the value of the Henry's law constant k calculated in Part A, 6.26 * 10^-4]" Assume that the composition of the air in the tank is the same as on
When the density of the string is changed, say increased, what is the effect on the frequency required to obtain a given number of loops
Compute the change in temperature when 1 g sodium chloride is dissolved in 250.0 mL of water is initially at 27 C. The heat capacity of water is 4.184 J/mL/K. Neglect the heat capacity of the NaCl.
A 1.3 g sample of C3H6O is burned completely in excess oxygen to yield CO2 (g) and H2O (l) at 25 C, releasing 41.4 kJ of energy. What is the enthalpy of formation of C3H6O?
Take element Z = 57 from the periodic table. Ionize it 56 times so that there is only one electron left orbiting around the nucleus. What is the ground state energy of the electron
Two particles with charges +4e and -7e are initially very far apart, which is the change in the electric potential energy
What is the freezing point of a solution containing 5.43 grams of butane (molar mass = 58.8 g/mole) dissolved in 50.0 grams of octane? The freezing point of pure octane is 25oC and the freezing poin
The dissociation equilibrium constants for the protonated form of alanine (a diprotic amino acid H2X+) are ka1=4.6 x 10^-3 and ka2= 2.0 x 10^-10 What is the pH of 50.00 mL of a 0.100 M solution of a
The fastest pitched baseball was measured at 46 m/s, what force did he produce on the ball during this record-setting pitch
Of the several landfill alternatives, which are preventative? Which take up the least space? Explain
Imagine that you send out a light flash at t=6.0 s as registered by your clock, At what time did your brother actually make this silly face and How far is your brother away from you
Two capacitors, C1 = 4.0mF and C2 = 9.0mF , are in series, Find the potential difference across second capacitor and Find the charge stored on the second capacitor
A 50.0-g object is attached to a horizontal spring, What is the velocity of the object when it is halfway to the equilibrium position if the surface is frictionless