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A sample of helium has a volume of 325 mL and a pressure of 655 mm Hg. What will be the pressure if the helium is compressed to 125 mL( T constant).
Acetone, C3H6O, and ethyl acetate, C4H8O2, are organic liquids often used as solvents. At 30 degrees C, the vapor pressure of acetone is 285 mmHg and the vapor pressure of ethyl acetate is 118 mmHg.
A student is asked to determine the formula of a hydrate of colbalt (II) chloride. The mass of the empty clean, dry crucible and cover, after heating is 22.446 g. A sample of 0.324 g of cobalt chloride is added to the crucible.
In another experiment it is found that 0.103 g of the compound produces 0.0460 g of NH3. What is the empirical formula of the compound
Calculate partition coefficient of caffeine between water and each of two organic solvents. (c) Can you use diethyl ether to extract caffeine from water? Why/why not.
In the reaction Cd+CuSO4?CdSO4+Cu, what is the reduction half reaction. What is the reducing agent. Explain your answer.
Calculate the heat released when 2.00 L of Cl2(g) with a density of 1.88g/L react with an excess of sodium metal at 25oC and 1 atm to form sodium chloride.
Write the balanced chemical equation for the neutralization reaction that occurs when an aqueous solution of nitric acid (HNO3) is mixed with an aqueous solution of sodium hydroxide (NaOH).
A cylinder containing a mixture of N2 and O2 is taken from the basement to the top of a 50-story building. Assuming that the temperature remains constant, which of the following properties of the gas change during the ascent
An athlete wants to acquire red blood cells from a donor with the same blood type. Taking into consideration that blood is composed of three components, plama, red blood cells, and leukocytes. what instrument have used in our lab experiments that ..
mass is obtained in the reaction, what mass of S2O3^2- was present initially, assuming the reaction went to completion? the density of the HSO3^- solution is 1.45 g/cm^3
Ammonia burns in oxygen according to: 4NH3(g) + 7O2(g) ? 4NO2(g) + 6H2O(l) ??H?_rxn^o=-1396 kJ given ?H_f^o(NH3)g = -46 kJ/mol and ?H_f^o(H2O)l = -286 kJ/mol the heat of formation of NO2(g) ?H_f^o(NO2)g (in kJ/mol) is: A) +48 B) -48 C) +34 D) -29
the henry law constant kh for o2 in water is 5.6610-5g l-1 torr-1 at 20 degrees c. calulate the concentration of
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