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When acetaldehyde at a pressure of 364 mmHg is introduced into an evacuated 500. mL flask at 518°C, the half-life for the second-order decomposition process, CH3CHO ----> CH4 + CO, is 410. s.
An object moves with a constant acceleration of 4.0 m/s2. If it starts with an initial speed of 30 m/s, how long does it take to reach a velocity of 250 m/s?
A hockey puck moves on an icy surface that is frictionless, with a constant speed of 30 m/s. How long does it take the puck to travel the length of the hockey rink (60 m)?
A spacecraft that is initially at rest turns on its engine at t = 0. If its mass is m = 3000 kg and the force from the engine is 45 N, what is the acceleration of the spacecraft?
You then run toward the person and push him out of the path of the brick, the instant before the brick reaches him. If you are initially 25 m from the building, how fast do you have to run?
Benzoyl chloride, C6H5COCl, reacts with water to form benzoic acid, C6H5COOH, and hydrochloric acid. This first-order reaction is 25% complete after 26 s. How much longer would one have to wait in o
What is the ratio of the final magnitude of the displacement to the total distance walked?
However, your parents argue that Apple releases new generations so frequently, it would be a massive waste of money to buy the latest model. In fact, most gadgets depreciate exponentially.
Apparent Weight, A 550-N physics student stands on a bathroom scale in an 850-kg (including the student) elevator that is supported by a cable. As the elevator stands moving, the scale reads 450 N.
Assume that potential V is maintained at x = 0, and that the potential is zero at x = L. In terms of L, d, V, %, and physical constants, derive expressions for (a) The electric field in the wire,
If her tree house is 30 m above the ground, what is the minimum (initial) speed you must use when throwing packages up to her?
An isotope of sodium 24Na, has a half-life of 15 hours. A sample of this isotope has mass 2 g. Use a graph to estimate the time required for the mass to be reduced to 0.01 g.
At a particular temperature the first-order gas-phase reaction N2O5 ----> 2NO2 + (1/2) O2 has a half-life for the disappearance of dinitrogen pentoxide of 5130 s. Suppose 0.450 atm of N2O5 is intro
Four 75kg spheres are located at the corners of a square of side 0.60m. Calculate the magnitude and direction of the gravitational force on one sphere due to the other three.
Waves on a Stick a flexible stick 2.0 m long is not fixed in any way and is free to vibrate. Make clear drawings of this stick vibrating in its first three harmonics, and then use your drawings to f
Two insulating spheres have radii r1 and r2, masses m1 and m2, and uniformly distributed charges -q1 and q2. They are released from rest when their centers are separated by a distance d.
What is the percent ionization of a solution prepared by dissolving 0.0223 mol of chloroacetic acid, HC2H2O2Cl) in 1.80 L of water? For chloroacetic acid, Ka = 1.4 ? 10-3.
Suppose part of this solution is then diluted to prepare 500.0ml of .200M. What volume of water was added to the original solution to prepare the diluted solution.
0.11 g of a monocarboxylic acid is neutralized by 12.5 mL of a 0.1 N sodium hydroxide solution. What is the molecular weight of the acid?
Calculate the molar heat of vaporization of a substance given that 0.383 mol of the substance absorbs 24.1 kJ of energy when it is vaporized.
Calculate the volume of hydrogen that should form from the mass of aluminum used in this experiement? The mass of aluminum is 2.004 grams.
The complete combustion of 1.076g of C9H8O in a bomb calorimeter ( Cccalorimeter=3.895 kJ/ degree C) produced an increase in temperature of 11.21C. Calculate the molar enthalpy of combustion in kJ/
A supermarket sells 2 cans of ground coffee for $18.50. the cost of coffee varies directly with the number of cans. how much do 5 cans of coffee cost?