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If a procedure calls for 2.0mL of concentrated nitric acid, what are the mass and moles of HNO3 actually used in the reaction
A 10 kg block of metal is massed on a spring scale in air. What is the desnity of the metal
how many grams of coniine would he have needed to ingest to give a 50% chance of causing his death? If Coniine is about 3.2% by weight of the hemlock leaves, how many grams of hemlock would need to
You are stranded on a deserted island. You have some wire, but no magnets. You decide to use the Earth's magnetic field, the only one available to you. What area must the coil have
A solution is prepared by dissolving 11.60 g of a mixture of sodium carbonate and sodium bicarbonate in 1.00 L of water. A 300.0- cm^3 sample of the solution is then treated with excess HNO3 and boi
A 6 m board of mass 7 kg is hinged at one end, with a 60 kg block nesting on the board 245 cm from the hings. A force ~F is applied vertically at the other end to lift of the board. Find the force e
A 100.0-mL aqueous sodium chloride solution is 14.5% NaCl by mass and has a density of 1.12 g/mL. What mass of solute would you add to make the boiling point of the solution 104.2 degree C? (Use i =
In an explosion, an object breaks down into two pieces, M1 and M2. M2 flies away at 3 times the speed of M1. Which mass has more momentum immediately after the explosion
The vapor pressure of water above this solution is found to be 0.3624 atm at 348.0 K. The vapor pressure of pure water at this temperature is 0.3804 atm.
Diethyl ether has a deltaH vap of 29.1 kJ/mol and a vapor pressure of 0.703 atm at 25.0 C. What is its vapor pressure at 81.0 C
Hydrogenic atoms in an ultraviolet light fall from energy quantum state n = 9 to state n = 2 while releasing ultraviolet photons. How many photons are being released per second
Waves from a radio station have a wavelength of 308 m. They travel by two paths to a home receiver 77.0 km from the transmitter. What is the minimum distance from the mountain to the receiver
How many chemicaly different hydrogens are in: 4'-Aminoacetophenone; 3'-aminoacetophenone; benzoic acid; 3-toluic acid;1,4-dimethoxybenzene; and fluorenone? alson how would you do a predicted chemic
A block with mass m = 4.6 kg is attached to two springs with spring constants kleft = 37 N/m and kright = 51 N/m. What is the effective spring constant of the two springs
An image of the moon is focused onto a screen using a converging lens of focal length f=35.3cm. What is the diameter of the moon's image
n = 3.78 mol of Hydrogen gas is initially at T = 366 K temperature and pi = 2.88×105 Pa pressure. How much work did the external force perform
If the balloon can barely lift an additional 2900N of passengers, breakfast, and champagne when the outside air density is 1.23kg/m3, FIND the average density of the heated gases in the envelope
In a football game, a tackle running at a constant speed of 5 m/s tackles a stationary receiver. What is the speed of the system's center of mass before the collision
A net force of 32 N accelerates a 4.7-kg mass over a distance of 15 m. What is the total work done by this net force
A proton is passing the origin. The magnetic field at the (x,y,z) position ( 2mm , 0 mm, 0 mm) is1.4×10?13?^T. What is the speed of the proton
A 65-kg woman cheats on her diet and eats a 612-Calorie (612 kcal) jelly doughnut for breakfast. If the human body is only 21% efficient in converting chemical energy to mechanical energy, how many s
a 0.90 kg book rests on a table. A downward force of 3.5 N is exerted on the top of the book by a hand pushing down on the book. What is the gravitational force acting on the book
A 72-kg base runner begins his slide into second base when he is moving at a speed of 3.9 m/s. How far does he slide
a small tropical fish is at the center of a water-filled spherical gishbowl 30cm in diameter. find the magnification of the fish to an observer outside the bowl
Execute the following mathematical operations and express each answer in scientific notation with the correct number of significant