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A 5.0 dm3 sample of oxygen at a pressure of 200kPa and 2.0dm3 sample of nitrogen at a pressure of 500kPa are introduced into a 2.5dm3 vessel. What is the total pressure in the vessel?
Designing and preparing aqueous buffer solution with the pH indicated.
A student heats 5.128 g sodium bicarbonate to completely decompose the sample to sodium carbonate. 3.2349 g of sodium carbonate was produced. Calculate the atom economy of this reaction.
The number of moles in 15.39 g of C2H6O (molar mass =46.1 g/mol) is ,You transfer a sample of gas at 17 degrees C from a volume of 4.71 L and 1.10 atm to a container at 37 degrees C.
If 95.0 mg of fluorine-18 is shipped at 8:00 a.m., how many milligrams of the radioisotope are still active if the sample arrives at the radiology laboratory at 1:30 p.m.
Is heat absorbed or evolved in the course of this reaction? Calculate the amount of heat transferred when 45.0 g of CH3OH (g) is decomposed by this reaction at constant pressure.
A sample of an unknown metal has a mass of 35.4 grams and a volume of 3.11 centimeter cube. calculate the density.
A 4.20 g nugget of pure gold absorbed 299 J of heat. The initial temperature was 22.0°C. What was the final temperature.
When 5.00 × 1022 molecules of ammonia react with 4.00 × 1022 molecules of oxygen, how many grams of nitrogen gas are produced? 4NH3(g) + 3O2(g) → 2N2(g) + 6H2O(g)
Combustion reactions are exothermic. The heat of reaction for the combustion of cyclohexane, C6H12, is 936.8 kcal/mol. What is the heat of combustion for cyclohexane in kcal/gram
Calculate the molecular weight of the compound? Given that Kf=1.86 and the compound in not ionic.
Free radicals are also important in many environmentally significant reactions. For example, photochemical smog, which forms as a result of the action of sunlight on air pollutants, is formed in part by the following two steps.
0.74 L of a 0.41 M solution is diluted to a final volume of 3200 mL. What is the resultant molarity?
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