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The enthalpy of formation of MX2 is ?Hf° = -829 kJ/mol. The enthalpy of sublimation of M is ?Hsub = 117 kJ/mol. The first and second ionization energies of M are IE1 = 717 kJ/mol and IE2 = 1433
Emily has a field with uniformly cut grass of height 2 cm which grows at a constant rate. How long would it sustain each animal alone
A light bulb has a resistance of 280 ?. It is connected to a standard wall socket (120 V rms, 60.0 Hz).Determine the current in the bulb
A water has a pH = 7.4 and an alkalinity of 400 mg/l as CaCO3. The first dissociation constant for carbonic acid (H2CO3) is K1 = 4.45e-7. Assume all activity coefficients are equal to 1.0. What is t
A man is dragging a trunk up the loading ramp of a mover's truck. The ramp has a slope angle of 20.0 ? , Find the vertical component of the force
what is the wavelength (in nanometers ) of the spectral line that correspond the n=6 level to the n=1 level in the hydrogen atom
You plan to fly a model airplane of mass 0.390 kg that is attached to a horizontal string. The plane will travel in a horizontal circle of radius 5.90 m. Find the speed at which you must fly the pla
What is the total hardness in mg/l as CaCO3. what is the total alkalinity in mg/l as CaCO3. what is the phenolphthalien alkalinity in mg/l as CaCO3. Calculate the total dissolved solids in mg/l. wha
A circuit consists of a resistor in series with an inductor and an ac generator that supplies a voltage of 115 V. Find the average power delivered in the circuit
In a series circuit, a generator (1436 Hz, 14.7 V) is connected to a 15.2-? resistor, a 3.85-µF capacitor, and a 5.47-mH inductor. Find the voltage across each circuit element
A 64.0-kg person holding two 0.750-kg bricks stands on a 2.20-kg skateboard. Initially, the skateboard and the person are at rest. What is the recoil speed of the person
Earth-Moon Center of Mass The Earth has a mass of 5.98×1024kg, the Moon has a mass of 7.35×1022kg, How far from the center of the Earth is the Earth-Moon center of mass
If 25.00 mL of 0.20 M HCl is titrated with 0.20 M NaOH, what is the pH of the solution after the addition of 20.00 mL of NaOH?
If an electrode has a potential of -1.004 V with respect to a saturated calomel electrode, what is the potential with respect to a silver-silver chloride electrode
A neutron (mass 1 u) strikes a deuteron (mass 2 u) and the two combine to form a tritium nucleus. What was the velocity of the deuteron
A cart of mass m moves with a speed v on a frictionless air track and collides with an identical cart that is stationary. what is the final kinetic energy of the system
Using Hess' Law, calculate the enthalpy of formation for C3H8(g) using the following thermodynamic data. C(s) + O2(g) ----> CO2(g) delta H =-393.5 kj/mol
A 20kg box is on a level surface pressed against a spring compressed 25cm and with k=1000 k/m. How far does the box go up the hill
Calculate the pH at the points in the titration of 40.00 mL of 0.425 M NH3 for the reaction below. NH3(aq) + HNO3 ? NH4+(aq) + NO3?(aq) For NH3, Kb = 1.8x10-5. Enter your answer with 2 decimal place
When spiking a volleyball, a player changes the velocity of the ball from 4.0m/s to -28m/s along a certain direction. what is the mass of the volleyball
In a typical golf swing, the club is in contact with the ball for about 0.0010 s. estimate the magnitude of the force exerted by the club on the ball
Calculate the theoretical yield in grams of the precipitate formed. 3. If the actual yield of the experiment was 90.5 mg, what is the % yield of Ag3PO4
A 100-kg object and a 400-kg object are separated by 4.20 m. Find the magnitude of the net gravitational force exerted by these objects on a 64.0-kg object placed midway between them
you are handed an apple that has a mass of 102g. to get a better of idea of what different pressure feel like, what is the pressure of the apple
Both of the sulfur-oxygen double bonds in SO_2 are polar. In which direction should the polarity arrows point? Both of the sulfur-oxygen double bonds in are polar.