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According to a story told by Lord Kelvin, one day when walking down from Chamonix to commence a tour of Mt. Blanc, "whom should I meet walking up (the trail) but (James) Joule, with a long thermometer in his hand, and a carriage with a lady in it not far off. He told me he had been married since we parted from Oxford, and he was going to try for (the measurement of the) elevation of temperature in waterfalls." Suppose Joule encountered the waterfall at Niagara Falls. Calculate the height if the temperature difference between the top and bottom of the waterfall is 0.20° F.
Lead(II) sulfide reacts with hydrogen peroxide to form lead(II) sulfate and water. How many grams of hydrogen peroxide are needed to react completely with 265 g of lead(II) sulfide?
How many grams of formic acid, HCOOH, must be added to 0.100 L of 0.130 M sodium formate, HCOONa, to yield a buffer solution with a pH of 4.40? Assume no volume change. Ka of HCOOH = 5.0 10-4.
Determine the final concentration if a 144-mL portion of that solution is diluted using water of 143 mL ?
what are the heats of formation of the following species.
Electrons are ejected from sodium metal by any light that has a wavelength shorter than 544 nm. What is the kinetic energy of an electron
How much HCl gas can be produced at STP by reacting 198 g of NaCl with excess H2SO4?NaCl + H2SO4 ! NaHSO4 + HCl.
calculate the equilibrium partial pressures of all gases in the reaction and set up the expression for Kp in terms of equilibrium partial pressures but do NOT solve.
a cylindrical glass tube 13.0 cm in length is filled with mercury. The mass of mercury needed to fill the tube is found to be 107.5g. Calculate the inner diameter of the tube in centimeters.
A 0.1752g sample of silver nitrate was dissolved in 502.3g of distilled water. Calculate the weight molarity of silver in this solution.
if 510 grams of sodium hydroxide reacts, how many grams of magnesium nitrate are needed for complete reaction?
Determine the solubility of N2 in water exposed to air at 25 C if the atmospheric pressure is 1.2 atm. Assume that the mole fraction of nitrogen is 0.78 in air and the Henry's law constant for nitrogen in water at this temperature is 6.1 10-4 M/at..
A 1L flask is filled with 0.25 mol N2and 0.65 mol H2 at 20 oC. These gases react to make NH3, heating up the flask to a temperature of 45 oC.
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