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How many grams of monosodium phosphate and disodium phosphate are needed to make 1L of 0.1M phosphate buffer at pH 7.4? The exact pKa for inorganic phosphate are 2.15, 6.82, and 12.38.
A golfer lines up for her first putt at a hole that is 18 m exactly northwest of her ball's location. She hits the ball 18 m and straight, but at the wrong angle, 38 degrees from due north. 1. In o
56g of metal carbonate, containing the unknown metal M, was heatedto give the metal oxide and CO2 according to thechemical equation below. The mass of CO2obtainedwas .376g. Determine the molar mass
The force has magnitude 2.0 N and is directed at a counterclockwise angle of 100° from the positive direction of the x axis. How much work is done by the force on the coin during the displacemen
The osmotic pressure of 180.0 mL solution of sucrose(C12H22O11) in ethanol at28.0°C is 1.85 atm. What is the molar concentration of the sucrose solution? Assume ideal behavior of the solution.
The Sun emits light waves with a power of 4x1026 Watts. Determine the intensity of light waves from the sun just outside the atmospheres of Venus, Earth and Mars.
An organic compound (molar mass=97) is dissolved in water to form asolution with a density of 1.05 g/mL and a molarity of 2.09 M. What is the molality of the solution?
The bullet then emerges on the other side of the board with a speed of +234 m/s. Assuming constant acceleration (rather, deceleration!) of the bullet while inside the wooden board, calculate the acc
Why is H2SO4 the limiting reagent. i understand you divide 2by 3 multiplied by the number given but i just get that one number.How do you determine the limiting reagent by that specific number
If the motion of the mass has an initial amplitude of 5.00 cm what is its maximum speed?. The amplitude decreases to 1.087 cm in 4.57 s, what is the damping constant for the system?
A standard of Pb2+ for an analysis using atomic absorption isprepared by first dissolving 1.0390 g dried Pb(NO3)2 in distilledwater containing 1% nitric acid.
A sky diver, with parachute unopened, falls 631 m in 15.6 s. Then she opens her parachute and falls another 347 m in 133 s. What is her average speed for the entire fall?
Glacier acetic acid and acetic anhydride is used for thepreparation of SnI4. These two compounds help SnI4 by creating awater free environment.
There are two small objects charged that repel each other, they both have a force F and are separated by a distance d. If the charge of both objects is reduced to F/4 of their original values and th
X-178 is a new drug developed by Pfizer that strongly inhibits theenzyme that causes migraines by binding to it with picomolar affinity. In a titrationcalorimeter you add a 0.2mM solution of X-178,
The electric field midway between two equal but opposite point charges is 856 N/C , and the distance between the charges is 12.3 cm
One mole of copper at a uniform temperature of 0°C is placed inthermal contact with a second mole of copper which, initially, isat a uniform temperature of 100°C.
The stationary ball moves off at 30° to the right of the moving ball's original direction. What is the speed of each ball after the collision?
If a block of continental crust and a block of oceanic crust are both 10 km thick and are "floating" on the aesthenosphere, how much higher is the top of the continental crust as compared to the oce
A certain copper ore contains 2.98% of Cu2S by mass, andthe remainder of the ore contains no copper. In 1991, a singleopen-air smelt furnace heated 32000 tons of this ore.
A sample of an unknown biochemical compound is found to have a percent composition of 57.14% carbon, 6.17% hydrogen, 9.52% nitrogen and the balance oxygen. What is the empirical formula for this co
A monatomic ideal gas is thermally insulated, so no heat can flow between it and its surroundings. Is it possible for the temperature of the gas to rise? And if so how?
Calculate the percentage of empty space in 1 mol of water at25 Celcius. Obtain the density. The volume of amolecule of water can be taken as the sum of the volume of the twohydrogen atoms and the ox
How much time passes between the first two instants when this particle has a displacement of y = 0.2 m?