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The equilibrium vapor pressure of water at 25 degrees celsius is 23.76 torr. What is the total pressure inside the flask before the reaction begins?
A 250.0 gram industrial mold absorbs 5,575 calories of heat when it is filled with an alloy. If the specific heat of the mold is 0.275 calories per gram degree Celsius, how much does its temperature
The human body generates heat by the metabolism of carbohydrates and other food materials. How much energy is required to melt the ice and warm the water to the body temperature?
The sensor in the torso of a crash-test dummy records the magnitude of the net external force acting on it. if the dummy is thrown forward with force of 130.0 N while simultaneously being hit from t
A spring hangs vertically. A 500 g mass is then hung on the spring, which stretches the spring 1.3 cm. Calculate the spring constant in units of N/m.
It was estimated that 25 years ago the average farm worker had a body DDT concentration of 22 ppm (parts per million by weight). Estimate what the farm worker's present concentration would be.
Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor:4NH3 + 5O2 > 4NO + 6H2O When 20.0 g NH3 and 50.0 g O2 are allowed to react, which is the limiting reagent? How much water
A cubical box that has been constructed from uniform metal plate of negligible thickness. The box is open at the top and has edge length L = 36 cm. Find (a) the x coordinate, (b) the y coordinate, a
Assume that when 0.500g of a mixture of hydrocarbons is burned in the bomb calorimeter with calorimeter constant 3.640KJ/C and its temperature rises by 6.76C. How much energy (in KJ) is released dur
Assume that you have 1.55g of nitroglycerin in a 603.0ml steel container at 20.0C and 1.00 pressure. How many mols of gas(air) were in the container originally?
what is the value of the coefficient of the friction if a 95-N horizontal force is exerted to move a 200-kg cart on level ground at uniform speed.
What is the force felt by the electrons and the nuclei in the rod when the external field described in the problem introduction is applied? (Ignore internal fields in the rod for the moment.)
During an all-night cram session, a student heats up a (0.6 10-3 m3) glass (Pyrex) beaker of cold coffee. Initially, the temperature is 18°C, and the beaker is filled to the brim.
What is the maximum kinetic energy of a photo electron ejected from cesium by 555nm light? note that if the wavelength of the light used to irradiate the cesium surface become longer than 600 nm.
The gravitational force between two sumo wrestlers just before they collide r=0.025 m is 2.77x10^-3 N if one wrestler has a mass of 157 kg, what is the mass of the other wrestler?
A mass of 355 g connected to a light spring of force constant 23.7 N/m oscillates on a horizontal, frictionless track. The amplitude of the motion is 5.9 cm. Calculate the total energy of the system
Find the wave speed for a transverse wave on a 5 m long clothes line with a mass of .2 kg ( for the whole 5 m) with a tension 160 N
What is the "effective" pressure difference across the membrane? If the hydraulic conductance of the membrane is 3 ml/hr/m2/mm Hg, what is the filtration rate of the solvent?
A daredevil decides to jump a canyon. Its walls are equally high and 11 m apart. He takes off by driving a motorcycle up a short ramp sloped at an angle of 24°. What minimum speed must he have i
The cross section area of the tank is 1 m^2 if the height of the tank water above the hole is maintained at 10 m what is volumetric flow rate out of the hole.
A 5.70 102 kg hot-air balloon takes off from rest at the surface of the earth. The nonconservative wind and lift forces take the balloon up, doing +9.70 104 J of work on the balloon in the process.
In some ways, all these atoms resemble a Bohr hydrogen atom with its electron in a high-numbered orbit. Explain why you might expect it to be the case?
Assuming all factors other than the activation energy remain the same, by how much does the rate of the reaction increase?
A tennis player receives a shot with the ball .06 kg traveling horizontally at 50 m/s and returns the shot with the ball traveling horizontally at 40 m/s in the opposite direction. what is the impu
What is the concentration (M) of Cd2+(aq) in the sample? Can you use the equation C= n/ V, find n , which is n=m/M and then i dont know what to do.. use avogadro's equation and find out the energy per