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The half-life for the reaction at 550C is 81.3 seconds. How long does it take for 89% of phosphine sample to decompose?
Given this Ksp for lead(II) chloride, find the molar solubility of this salt in a 0.05M of CaCl2 solution. Will Ca(OH)2 prrecipitate if a 0.1M solution of CaCl2 is added to a solution with a pH of 10.
A portable water heater transfers 225 watts of power to 5.5 L of water. How much time will it take the water heater to heat the 5.5 L of water from 22 to 40 degrees Celsius?
The contents of one 40-lb bag of topsoil can cover 10.0 square feet of ground to a depth of 1.0 in. How many bags are needed to cover a plot that measures 200.0 meters by 300.0 meters to a depth of
What happens to the mass of an icecube when we melt it an open container.
Calculate the increase in entropy when 3.50 mol of monatomic perfect gas with Cp = 5/2 R is heated from 250 K to 700 K and simultaneously expand from 20.0 L to 60.0 L.
What is the new volume if the pressure is decreased to 325 mm Hg and the temperature is decreased to -12.5 degree celsius?
You are charged to do a study on the amount of intimate partner violence on a Midwestern college campus. There are approximately 22, 000 students who attend this university.
What is the mass percent CH3OH of a 0.256 m CH3OH(aq) solution.
Explain how alkene/aromatic C-H stretches are distinguished from alkane C-H stretches. Do the C-H stretch peaks in the IR spectra of triphenylmethanol.
The wo naturally occuring isotopes are B-10 with a mass of 10.0129 amu and B-11 with a mass of 11.0093 amu. Determine the percent of naturally occuring B-10.
Positron X and positron Y are each traveling at the same speed. How does the de Broglie wavelength of the two positrons compare?
A gas company in Massachusetts charges $1.30 for 15 ft3 of natural gas (CH4) measured at 20 oC and 1.0 atm. Calculate the cost of heating 200 mL of water (enough to make a cup of coffee or tea) from
0.400 mol of octane is allowed to react with 0.600 mol of oxygen. Which is the limiting reactant?
Draw the substrate concentration versus reaction velocity plot of phosphofructokinase, given that all of the modulators bind at a secondary regulatory site of the enzyme.
The first billiard ball completely stops and the second one rolls away with a velocity of 3.8 . Assume the first billiard ball is the system. Find the Work, q(heat) and delta H.
Ozone reacts with nitric oxide discharged from jet planes to form oxygen gas and nitrogen dioxide. 0.740g of ozone react with 0.670g of nitric oxide. Determine the identity and quantity of the reac
Bromothymol blue is a common acid-base indicator. It has a Ka equal to 1.6 X 10^-7. Its unionized form is yellow and its conjugate base is blue. What color would a solution have at pH=5.8?
The solubility of barium carbonate,BaCO3, is .0100 g/L . Its molar mass is 197.6. What is the Ksp of barium carbonate?
Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat some respiratory ailments. What percent (by moles) of He is present in a helium-oxygen mixture having a
25.0 mL of ethanol (density = 0.789 g/mL) initially at 7.4°C is mixed with 32.1 mL of water (density = 1.0 g/mL) initially at 25.3°C in an insulated beaker. Assuming that no heat is lost, wh
what concentration of x would be required for the transmittance to be increased by a factor of 3 when a factor of 3 when a 1.00-cm cell was used?
A student placed 14.5 of glucose () in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.- mark on the neck of the flask
Naturally occurring silver contains 107Ag (amu 106.91) and 109Ag (amu 108.90) with mass percentages of 51.840% and 48.160%, respectively. What is the atomic mass of this mixture?
A 40.0 g sample of solid ammonium carbonate is placed in a closed evacuated 3.00 L flask and heated to 400 degrees C. Write the kp equilibrium constant expression for the reaction.