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A ball is dropped from a height of 3 meters and rebounds from a height of 2 meters. What is the velocity of the ball before it hits the floor? What is the velocity of the bell before it leave the fl
what is the maximum work that could be be obtained if the tank, the device and the surroundings are maintained at 298? Assume the volume of the device is much smaller than the tank volume.
If a raindrop weighs 50. mg on average and 5.1x10^5 raindrops fall on a lawn every minute, what mass (in kg) of rain falls on the lawn in 2.6 h?
This reaction has a 65.0% yield. How much N2 is consumed if 13.6 g of FeN are produced?
What is the pH of this solution? How many mL of 12 M HCl must be added to 0.500 L of the original buffer to change its pH to 9.00?
The speed of sound is 344 m/s. You have built a really fantastic car that can really go fast. If the car can accelerate at 22.4 m/s, how much time till you reach the speed of sound? How many kilomet
It was found that 0.475 g of V was deposited on the cathode. What was the original oxidation state of vanadium?
A 15.0 kg object is moving with velocity of 17.5 m/s2. A force of -50 N acts on the object and its velocity becomes 3.20 m/s2. What is the displacement of the object while the force acts?
Assume that patient blood lead levels are 0.560 , that total blood volume is 5.1 , and that 1 of succimer binds 1 of lead. What minimum mass of succimer in milligrams is needed to bind all of the le
what is the enthalpy change needed to change 3kg of liquid water at 0C to steam at 0.1MPa and 150C
What mass of HgO was originally present? The vapor pressure of water is 23.8 mm Hg at 25.0°C. Use molar masses with at least as many significant figures as the data given.
What is the product of a modified perkin reaction using 3-benzoylpropionic acid + benzaldehyde + sodium acetate + acetic anhydride when heated in 100 degrees celsius?
What is the total number of liters of gas formed when 228g NH4NO3 is decomposed?
The force of the wind on the sails of a sailboat is 370 N north. The water exerts a force of 170 N east. If the boat (including crew) has a mass of 320 kg, what are the magnitude and direction of it
The atomic weight of a newly discovered el- ement is 10.600 amu. It has two naturally occuring isotopes. One has a mass of 10.000 and a natural abundance of 70.000%. What is the isotopic mass of the
What is the volume, in liters, of 0.100 g of C2H2F4 vapor at 0.0928 atm and 22.3°C?
The temperature of the resulting solution increased to 35 degrees C. How much heat is in kilojoules was released by this reaction?
A river has a current with a velocity of 1.5 m/s due east. A boat whose speed in still water is 5 m/s directed north a cross a 100 m wide river. with what speed will the boat cross the river?
What is the boiling point of a solution made by adding 6.79 g of magnesium chloride to 242.0 g of water?
Calculate the theoretical yield of C2H5Cl when 106 g of C2H6 reacts with 236 g of Cl2 assuming that C2H6 and Cl2 react only to form C2H5Cl and HCl.
Calculate delta Ssurr for the following reactions at 29 degrees celcius and 1 atm. C3H8(g) + 5O2(g) and 3CO2(g) + 4H2O(l) delta H = -221 kJ b.
How close to the goal can the hare let the tortoise approach before resuming the race, which the tortoise wins in a photo finish? Assume that, when moving, both animals move steadily at their respec
A student takes 195. g of BaCl2, and reacts it according to the following equation: 3BaCl2 + Al2(SO4)3 → 3BaSO4 + 2AlCl3.
A pound of coffee beans yields 53 cups of coffee (4 cups = 1 ). How many milliliters of coffee can be obtained from 1 of coffee beans?
What would be the appropriate equilibrium temperature of a system obtained by adding 25.0 g of ice at 0 °C to 250.0 mL of "hot" (80 °C) coffee, assuming that the heat capacity.