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How many moles of ozone would there be in the air above Los Angeles County (area about 4000 square miles; consider a height of 10m above the ground) if ozone was at this concentration?
What is the final temperature in a squeezed cold pack that contains 41.0 g of NH4NO3 dissolved in 125 mL of water? Assume a specific heat of 4.18J/g*C for the solution, an initial temperature of 26
In the first 12.0 of the reaction, 1.8×10-2 of is produced in a reaction vessel with a volume of 0.260 . What is the average rate of the reaction over this time interval?
Determine the mass of CaBr2 you would need to make 500 mL of a 1.2M solution.
The final number of moles (n_2) is 2.00 rm mol. Use the simulation to find the volume (V_1) of 1.00 rm mol of helium at 273 rm K and calculate the final volume (V_2).
What is the boiling point elevation when 43.5 g of the dye magenta is dissolved in 1650 g of ethanol? Kb for ethanol is 1.20 Cdegrees/m
The sledge moves a distance of 19.8 m on a horizontal surface. The coefficient of kinetic friction between the sledge and surface is 0.500. (a) What is the tension in the rope?
A 20 mL sample of 0.150 M KOH is titrated with 0.125 M HClO4 solution. Calculate the pH after 23.5 mL, 24 mL, 26.5 mL, and 30 mL of acid have been added.
A 400g lemming (does anyone remember that old computer game?) waddles horizontally off a small 4.9m high cliff with a speed of 0.5ms-1.How far from the base of the cliff will the lemming land? What
Consider the dissociation of the tricrotic acid, H3Y. Use the values of K(a1), K(a2), K(a3), and K(w) to evaluate the equilibrium constants associated with each of the reactions shown below:
Consider the following equation: CO + 2 H2 → CH3OH ?H rxn = -128 kJ Calculate the amount of heat (in kJ) associated with complete reaction of 8.08 g H2.
A 1300kg car travels north along Murdoch Drive at 65km/h. The car collides and becomes stuck to a 5000kg truck travelling west at along South Street at the intersection of South Street and Murdoch D
During ascent the temperature of the gas falls from 22°C to -21°C. Calculate the volume of the balloon at its final altitude.
Why is the first step in an electrophilic aromatic bromination reaction so much more endothermic than the first step in an electrophilic addition to an alkene?
A molecule has an excited state electronic energy level that emits radiation of 1/λ = 360 cm-1 when it falls to the ground state. The ground state is non-degenerate and the excited state is d
Sketch showing the acceleration of the canon ball over time if it was fired at 30°, 45° and 60° above the horizontal.
In a certain oil spill, hydrocarbons from the oil disappeared with a first-order rate constant of 2 ^ 10 -6 s -1. How many days did it take for the oil spill to decrease to 10% of its initial value?
52.0 mL of a 1.70 M solution is diluted to a volume of 248 mL. A 124-mL portion of that solution is diluted using 169 mL of water. What is the final concentration?
Suppose you have equal volumes of saturated solution NaNO3, Na2SO4, and PbS. which solution would dissolve the most with PbSO4?
The water level in a graduated cylinder initially at 220 rises to 279 after a piece of lead is submerged. What is the mass in grams of the lead?
A 350. mL air sample collected at 35 Celsius has a pressure of 550. torr. What pressure will the air exert if it is allowed to expand to 425 mL at 57 Celsius .
Light of wavelength 633 nm from a distant source is incident on a slit 0.750 mm wide, and the resulting diffraction pattern is observed on a screen 3.50 m away. What is the distance between the two
A solution is prepared by adding some solid BaCO3 to water and allowing the solid to come to equilibrium with the solution. What are the concentrations of Ba2+ and CO32- in the solution?
A space station, in the form of a wheel 135 m in diameter, rotates to provide an "artificial gravity" of 3.50 m/s2 for persons who walk around on the inner wall of the outer rim. Find the rate of ro
The acid-dissociation constants of phosphoric acid (H3PO4) are Ka1 = 7.5 × 10-3, Ka2 = 6.2 × 10-8, 25) and Ka3 = 4.2 × 10-13 at 25.0 °C. What is the molar concentration of pho