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What is the composition, in atom percent, of an alloy that consists of a) 90.5 wt% Ag and b) 9.5 wt% Cu? Assume that the atomic weights for silver and copper are, respectively, 107.87 and 63.55 g/mol. Round off your answers to 3 significant digits.
The extent of ionization of a weak electrolyte is increased by adding to the solution a strong electrolyte that has an ion in common with the weak electrolyte.
A molecule having a molar mass of 190.3 g/mol crystallizes to a cubic solid where each edge of the unit cell is 638.0 pm. Each unit cell contains 2 molecules. What is the bulk density of the crystal
List the individual steps used in constructing a Born - Haber cycle for the formation of barium iodide (BaI2) from the elements. Which of the steps would you expect to be exothermic
Calculate the number of 222Rn isotopes (t1/2 = 3.8 d) at the beginning and end of 25 days. Assume STP conditions.
in the final step of the purification process in the miniscale procedure for preparing 1-bromobutane from sodium
A 0.113 g sample of a gas exerts a pressure of 780 torr in a 50.4 mL container at 23?C.What is the molar mass of this gas?
What is the molarity (M) of a solution that contains 2.08 grams of NaOH (MM = 40.00 g/mol) in 79.65 mL of solution.
The variation of stress-concentration factor for a bar with fillet that is axially loaded shows that the kt approached infinity as the r/d ratio decrease.
Calculate (a). the kilograms of water per minute needed to remove the sulfur dioxide assuming that the exit water is in equilibrium with the entering gas and (b) the ratio of the water stream to the gas stream. The Henry's law constant for sulfur ..
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 cm-1 The C4H6O compound liberates a gas when treated with C2H5MgBr.
At a pressure of 1 atmosphere and a temperature of 25 °C, 500 cm3 of the gas HX has a mass of 0.400 g. Calculate the value of the relative atomic mass of X and hence identify element X.
If the temperatures of a sample of gas is held constant and the volume is 5.0 L at a pressure of 1.0 atm. If the volume is reduced to 2.5 L the new pressure of the gas will be
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