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Based on this value and the standard enthalpies of formation for the other substances, what is the standard enthalpy of formation of CH3CH2OH(g) ? kJ/mol.
A 150- crate, starting from rest, is pulled across a floor with a constant horizontal force of 360 . For the first 11 the floor is frictionless, and for the next 11 the coefficient of friction is 0.
Two stationary point charges of 4.00 nC and 2.00 nC are separated by a distance of 60.0 {rm cm}. An electron is released from rest at a point midway between the charges and moves along the line con
A flask contains 0.320mol of liquid bromine, Br2. Determine the number of bromine molecules present in the flask. Express your answer numerically in molecules.
A man pushes a lawn mower on a level lawn with a force to 200 N. If 40% of this force directed horizontally, how much work, in J, is done by the man in pushing the mower 6.0 m?
A simple pendulum has lenght of 2.0m and mass of 0.5kg.It is hanging from the room of a car that is traveling at 5m/s and banking a corner of radius 15m. Calculate the time period of oscillation for
Just as before, you suspend the balls from insulated strings with their centers 3 cm apart. What is the magnitude of the force between them?
Combustion analysis of toluene, a common organic solvent, gives 5.89mg of CO2 and 1.37mg of H2O. If the compound contains only carbon and hydrogen, what is its empirical formula?
He pushes hard enough to get the desk moving and continues pushing with that force for 5.00s. how much work does he do on the desk?
The acceleration of gravity is 9.81 m/s^2. Assuming that air resistance is simply a constant 96 N force on the person during the fall, determine the person's velocity just before hitting the net. An
The difference in the mass of 100 moles each of sodium atoms and sodium ions is 5.48002 g. Compute the mass of an electron.
A 200n roller is suspended freely by cord that passes over a frictionless pulley and is connected to a block that lies on a horizontal plane as shown the coeffiecient of static friction us between
A woman on a 10-speed bicycle travels at 9 m/s relative to the ground as she passes a little boy on a tricycle going in the opposite direction. If the boy is traveling at 1 m/s relative to the groun
What is the lift force exerted by the air on the rotors? What is the tension in the cable (ignore its mass) that connects the car to the helicopter?
Aspirin (acetylsalicylic acid) is a weak acid with a pKa of 3.4. Stomach acid has a pH of approximately 1.4. What is the approximate ratio of the protonated form of aspirin to the deprotonated form
Suppose 1.91 g of the vapor of a volatile liquid is able to fill a 408-mL flask at 100.4 degrees Celsius and 765 mmHG. What is the molar mass of the liquid?
A race car has a mass of 705 kg. It starts from rest and travels 41.0 m in 3.0 s. The car is uniformly accelerated during the entire time. What net force is exerted on it?
Estimate the electric field at a point 2.40 cm perpendicular to the midpoint of a uniformly charged 2.00 m-long thin wire carrying a total charge of 4.60x10^-6
Ammonia (NH3) is widely used as a fertilizer and in many household cleaners. How much ammonia is produced when 7.8 mol of hydrogen gas react with an excess of nitrogen gas? Answer in units of mol
The acceleration of gravity is 9.8 m/s2 . If the object's speed reaches one-half its terminal speed in 3.048 s, determine the terminal speed.
Determine which reactant is oxidized, which reactant is reduced, which reactant is the oxidizing agent, and which reactant is the reducing agent.
Find the value of (theta) for which the reflection on the vertical surface of the paperweight exactly satisfies the condition for total internal reflection.
A tapered, pressurized tank for a rocket contains 0.250 m3 of kerosene, which has a mass of 205 kg. The pressure at the top of the kerosene is 2.01 x 105 Pa. The pressure force of 18.0 kN on the ta
It will be traveling with speed 197 m/s. We have a large and powerful spring whose stiffness is 2.5x10^5 N/m. How much must we compress the spring?
Two skaters that are initially at rest push off from one another. One has a mass of 50 kg and moves with a speed of 4.0 m/s to the right after pushing off. What is the velocity of the other skater w