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A total area of 3.63*10^8km^2, and an average concentration of dissolved gold of 5.8*10^-9g/L. a) how many grams of gold are in the oceans? b) how many m^3 of gold are in the oceans?
A 2.88 mol sample of an ideal gas expands reversibly and isothermally at 286 K until its volume is doubled. What is the increase in entropy of the gas?
The rate constant for this reaction is 2.3 x 10-3 M-1 days-1 at a given temperature. Suppose you started with 2 M of HCN(aq), what would be the molar concentration of HCN(aq) at 20 days?
An 82 ohms resistor has a current of 0.73 A and is connected in series with a 140 ohms resistor. What is the emf of the battery to which the resistors are connected?
A portable CD player operates with a current of 27mA at a potential difference of 4.2 V. What is the power usage of the player?
The first order rate constant at a given high temperature is 5.91 x 10-3 min-1. What fraction of the original sample remains after 45 minutes?
A current of 0.83 A flows through a copper wire 0.50 mm in diameter when it is connected to a potential difference of 15 V. What is the length of the wire?
Forty-two (42.0) grams of nitrogen gas at 298 K and 745 torr has a volume of 37.42 L. What volume will it occupy if the pressure is increased to 894 torr at constant temperature?
What is the minimum number of 70 ohms resistors that must be connected in parallel to produce an equivalent resistance of 12 ohms or less?
Write expressions for the equilibrium constants for the following reactions: Formulate these expressions in terms of the degree of dissociation.
A rifle is aimed horizontally at a target 46 away. The bullet hits the target 2.5 below the aim point. (a) What was the bullet's flight time?
An electron in the hydrogen atom is in an excited state given by (n=4, l=3, ml=2, ms=1/2). List the possible final states the system could be in after the emission of photon. Include in the list the
King Arthur's knights use a catapult to launch a rock from their vantage point on top of the castle wall, 15 above the moat. The rock is launched at a speed of 26 and an angle of 32 above the horiz
Calculate the de Broglie wavelength of the electron in the n=1 state of the hydrogen atom.
The allowed energies of a simple atom are 0.0 eV, 5.0 eV and 8.0 eV. An electron traveling at a speed of 1.8×10^6 m/s collisionally excites the atom. What is the minimum speed the electron cou
What is the orbital angular momentum for the lowest electron orbit in the Hydrogen atom?
The electron and proton of a hydrogen atom are separated (on the average) by a distance of approximately 5.3 x 10-11 m. Find the magnitude of the electric force.
You are given a 10-mH inductor and 2 capacitors,of 5.0 and 2.0-MF capacitance. List the resonant frequencies that can be generated by connecting these element in various combinations.
Two small plastic spheres each have a mass of 2.0 g and a charge of -50.0 nC. They are placed 2.0 cm apart. What is the magnitude of the electric force between the spheres?
0.375 g of a monoprotic acid (mm = 245 g/mol) is dissolved in water to produce 25.0 mL of a solution with pH = 3.28. Determine the ionization constant of the acid.
When a 6.00-g sample of KCN is dissolved in water in a calorimeter that has a total heat capacity of 3.850 kJ·K-1, the temperature decreases by 0.280 K. Calculate the molar heat of solutio
A particle is moving in a simple harmonic oscillator potential V(x) = (kx^2)/2 x <= 0, but with infinite potential barrier at x = 0 (the paddle ball potential). Calculate the allowed wave functio
How do you who that both ZnS and CuS will precipitate at pH8. 2) Show that only CuS will precipitate when (H3O+) = 0.3M.
Estimate the energy of a proton in the nucleus by finding the first three allowed energies of a proton in a 5.0 fm long box.
You shine red laser light with wavelength 670 nm through two narrow slits where the spacing between the slits is 0.005 mm. You use a screen placed far from the slits to detect the interference patte