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It is often possible to change a hydrate into an anhydrous compound by heating it to drive off the water (dehydration).A 49.38 gram sample of a hydrate of BaI2 was heated thoroughly in a porcelain crucible, until its weight remained constant. After heating, 45.22 grams of the anhydrous compound remained. What is the formula of the hydrate?
How many grams of P2O5 gas are present in a 750 ml container that is at 75 degrees C and at a pressure of 590 mm Hg?
Calculate the formula mass of each compound given below. Keep at least one decimal place in atomic masses from the periodic table.
Calculate the molar mass of a nonelectrolyte that lowers the freezing point of 25.00 g of water to -3.9 degrees Celsius when 4.27 g of the substance is dissolved in the water.
What quality of heat is required to change the temperature of 30.0g of water at 10Cto 25C
choose the answer that has the following compounds correctly arranged with respect to acid catalyzed hydrolysis.
How many moles of water, H2O, are present in 75.0g H20? A. 4.17 moles B. 4.41 moles C. 75.0 moles D. 1.35 x 10^3 moles C 7.50 moles
A first order reaction has a rate constant of 0.251 at 17 degrees C. Given that the Arrhenius constant for the reaction is 8.18 x 10^11 sec^-1, calculate the value of the activation energy in KILOJOULES
Suggest a reason why the rates of chemical reactions typically increase with increasing temperature.
If 8 moles of the gas A is placed in a 60L tank with 1 mole of B at 0 degrees celcius and 1 atm, how many moles of gas are present in the tank when the reaction is complete? 2A(g) + B(g) = 3C(g) + D(g)
Calculate the pH during the titration of 100.0 mL of 0.200 M HCl with 0.400 M NaOH. First what is the initial pH (before any NaOH is added)? - What is the pH after 38.4 mL of NaOH are added?
How many grams of nitrogen monoxide are produced when copper metal reacts with nitric acid to form water and 5.92 g of copper(II) nitrate in addition to the nitrogen monoxide?
What is the freezing point of a 28.6% (by mass) aqueous solution of HCl. Assume the HCl is 100% ionized.
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