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A compound with a partition coefficient (Kp) of 0.5 betweensolvents A and B ([A]/[B] = 0.5) is dissolved in 100 mL of A. Which is more effective: extracting once with 70 mL of B or extracting twice with 35 mL of B each time?
What is the enthalpy change for the combustion of 12.5 g C4H10 in excess oxygen? C4H10 g + 13/2 O2 g = 4 CO2 g + 5 H2O g H= -1895 kJ
when a solution of cuii chloride cucl2 is added to a solution of potassium sulfide k2s a black precipitate of copper
What mass of copper in g can be deposited by the passage of 1.0 A for 4.0 hr through a solution of CuCl2
Calculate the volume of O2 at STP required for the complete combustion of 4.23 L of acetylene (C2H2) at STP.
What is the freezing point of a solution that contains 12.0 g of glucose (C6H12O6) in 50.0 g of water (Kf = 1.86°C/m)
What percent (by moles) of He is present in a helium-oxygen mixture having a density of 0.518g/L at 25 ?C and 721
For each of the following experimental or calculations errors, tell of the calculated value of R, writte if would be too high, too low or unchanged.
the rate constant for the second order -reaction is 2NOBr(g)------>2NO(g)+Br2(g) is 48 L/mol*min at a certian temperture. How long will it take for 90.0% of a .0200M solution of NOBr to decompose.
Suppose that an atmospheric chemist combines 165 of methane at STP, 870 of oxygen at STP, and 56.5 of at STP in a 1.8 flask.
Identify the following compound from its IR and proton NMR spectra. C4H6O: NMR: ? 2.43 (1H, t, J = 2 Hz); ? 3.41 (3H, s); ? 4.10 (2H, d, J = 2 Hz) IR: 2125, 3300 cm1
what are the chemical shift,integration(#H),multiplicity,assignment and type of hydrogen in C8 H10 O and i have to identify the unknown. help please i have 4 signals
How many milliliters of a 533 mL solution of 1.3 M K3PO4 must be used to make 316 mL of a solution that has 0.79 moles of K+?
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