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A village maintains a large tank with an open top, containing water for emergencies. The water can drain from the tank through a hose of diameter 6.65 cm. The hose ends with a nozzle of diameter 2.5
Sodium atoms emit light with a wavelength of 330 nm when an electron moves from a 4 p orbital to a 3 s orbital. What is the energy difference between the orbitals in kilojoules per mole?
In a calibration experiment, a 0.98 millimole sample of Na2CO3 gave 0.81 millimoles of CO2 gas. If a 0.342 g of pure Na2CO3 was reacted with excess acid, what volume of gas will be measured on this
When one gallon of gasoline is burned in a car engine, 1.22 108 J of internal energy is released. Suppose that 1.05 108 J of this energy flows directly into the surroundings (engine block and exhaus
Determine if the following reactions will form a precipitate when solutions of the reactants are mixed. If a precipitate is formed when the reactants are mixed, write the balanced formula unit.
A 200 weather rocket is loaded with 100 kg of fuel and fired straight up. It accelerates upward at 30 m/s^2 for 33 s, then runs out of fuel. Ignore any air resistance effects. What is the rocket's m
Methane gas, CH4, effuses through a barrier at a rate of 0.568 mL/minute. If an unknown gas effuses through the same barrier at a rate of 0.343 mL/minute, what is the molar mass of the gas?
A 62 kg solid cylinder, 3.27 m long and with an end radius of 4.1 cm, stands on one end. How much pressure does it exert? The acceleration of gravity is 9.8.
Calculate the enthalpy change, Delta H, for this reaction per mole of X. Assume that the specific heat and density of the resulting solution are equal to those of water.
A 15 g rifle bullet traveling 245 m/s buries itself in a 3.9 kg pendulum hanging on a 2.7 m long string, which makes the pendulum swing upward in an arc. Determine the vertical and horizontal compo
After some argon has been used, the pressure is 2.00 MPa at a temperature of 19 degrees Celcius. What mass (g) or argon remains in the cylinder.
Atmospheric pressure at sea level is 1 atm due to the one square meter column of air extend- ing from the Earth's surface beyond the outer atmosphere. This column weighs approxi- mately 10,000 kg. G
What happens to the angular velocity of a rotating platform as a person walks from the outer rim of the platform toward the center of the platform?
The mass of a robot is 5200 kg. This robot weighs 3750 N more on planet A than it does on planet B. Both planets have the same radius of 1.33 107 m. What is the difference MA - MB in the masses of t
Explain why an aqueous solution of monosodium phosphate would be ineffective for extracting benzoic acid (5) from a diethyl ether solution.
A herd of wild horses races across the flat, open plains of the Great Basin in central Nevada. If the horses are running at 12.1 m/s at a compass heading of 286 degrees, what is the northward compon
Calculate the molar mass of the noble gas krypton in a natural sample, which is 0.84% 78 Kr (molar mass 77.92 g/mol), 2.2% 80 Kr (molar mass 79.91 g/mol).
The vapor pressure of water at 30C is 31.8 mmHg. What is the vapor pressure (mmHg) of an solution of 396 g sucrose in 620 g water? (MW sucrose=342)
While running, a person dissipates about 0.593 J of mechanical energy per step per kilogram of body mass. If a 62.6 kg runner dissipates a power of 60.9 W during a race, how fast is the person runn
If we begin with an initial SO2Cl2 pressure of 450 torr, what is pressure of substance after 60? At what time will the pressure of SO2CL2 decline to one-tenth its initial value?
How much heat is absorbed by a persons hand if 100 grams of steam at 100°C is first converted to liquid water at 100°C and then cooled to normal body temperature?
A metal-plating waste contains 20mg/L Cu2+, and it is desired to add Ca(OH)2 to precipitate all but 0.5mg/L of the copper. To what concentration in moles per liter must the hydroxide concentration b
A 430 g football is lying on the ground, then is kicked and is moving at 25 m/s. If the duration of the impact was 0.0010 s, what was the average force on the ball?
During the spin-dry cycle of a washing machine, the motor slows from 80 rad/s to 40rad/s while the turning the drum through an angle of 120 radians. What is the magnitude of the angular acceleration
At a certain temperature and pressure 0.70 L of H2 reacts with 0.70 L of I2. If all the H2 and I2 are consumed, what volume of HI, at the same temperature and pressure, will be produced?