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Liquid helium at 4.2 K has a density of 0.147 g/mL. Suppose that a 2.50-L metal bottle that contains air at 105K and 2.0 atm pressure is sealed off. If we inject 120.0 mL of liquid helium and allow the entire system to warm to room temperature (25°C), what is the pressure inside the bottle?
The names of esters consist of a first name and a last name. Which of the following correctly describes this naming system. the first name is the name of the alcohol, and the last name is the name of the acid
A carbon-hydrogen-oxygen containing compound yields 1.029 g CO2 and 0.198 g H2O in a combustion analysis( note that this means O2 was added the overall reaction) what is the empirical formula? if the Molar mass is 138.16 what is the molecular form..
A primary sedimentation tank has 140 mg/L of BOD in its effluent. The effluent flows into an activated sludge process at a rate of 4.8 MGD. The treatment must reduce the BOD by 125 mg/L so that it can meet an effluent requirement of 15 mg/L. How m..
Calculate the work done in Joules (for each case) when one mole of an ideal gas, initially at P = 9atm, T = 298K is expanded isothermally to P=1atm if
A Nylon 4-6 polymer with an average molecular weight of 10,000g/mol is reffered to as Nylon 4-6 (10,000). If one repeat unit of Nylon 4-6(10,000). If one repeat unit of Nylon 4-6 has a molecular weight of 198.26 g/mol, how many repeat units are pr..
what is the heat flow of hot water added to cold water? What is the heat flow of the cold water? hot water was 52.5 C the cold water was 21.7 C the final temperature was mass of cold water was 49.35g
A 500.0 mL sample of 0.200 M sodium phosphate is mixed with 400.0 mL of 0.237 M barium chloride. what is the mass of the solid produced
Would the desired reaction occure if ethanol or t-butyl alcohol were used instead of isopropyl alcohol in the attempted photochemical dimerization of benzophenone?
A voltaic cell utilizes the following reaction: 2Fe3+ + H2 --> 2Fe2+ + 2H+ what is the emf of this cell under standard conditions? what is the emf for this cell
The final volume of the system is 58.0 L. What was the initial volume of the system if the internal energy of the system decreased by 102.5 J?
sodium hydrogen carbonate (NaHCO3) is mixed with 10.0 grams of sodium carbonate in enough de-ionized water to give a total volume of 250.0 ml. What is the pH of the resulting solution
Calculate the number of moles and the number of grams of the indicated solutes present in each of the following solution samples.
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