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An element crystallises in a body centered cubic lattice. The edge of the unit cell is 286pm and the density is 7.92cm3. What is the atomic mass of the element?
The following reaction has equilibrium constant Kc=32, calculate the equilibrium concentration of CH2O if 2.50 mol of CH2O is placed in an empty 5.0 L reaction chamber.
If 16.0 mL of .150 M HCL is needed to neutralize all the NH3 from a 2.25-g sample of organic material, calculate the mass percentage of nitrogen in the sample.
An enzyme preparation from isolated beef liver mitochondria has the capacity to carry out all of the reactions of the tricarboxylic acid cycle when supplied with the essential precursors of acetylCoA, NAD+, FAD, GDP, and Pi2-.
Explain what is the pH at the equivalence point in the titration of 50mL of 0.240 M HCN with 0.200 M KOH given that Ka for HCN is 4.9 x 10-10
Depict whether or not a precipitate will form when a solution containing 1x10-2 M Pb2+ ions is added to a 2 x 10-4M solution of I- ions the Ksp of PbI2 is 9.8×10-9
Assume that the specific heat of the substance at P=25 bar is temperature independent and equal to c_p=4.20 kJ/kg*K. Sketch the P-v and T-s diagrams of the cycle.
a flammable gas made up only of carbon and hydrogen is found to effuse through a small hole in 1.50 min. under the same
what mass of naoh s must be added to 1.0 l of 0.050 m nh3 to ensure that the percent ionization of nh3 is no greater
A sample of gas has an initial volume of 3.9L at a pressure of 715mm Hg . If the volume of the gas is increased to 5.5L , what will the pressure be? (Assume constant temperature.) Express your answer using two significant figures.
Refer to the Galvanic cel below (the contents of each half-cell are written beneath each compartment): 0.10 M MnO4- 0.40 M Cr3+
which of the following is not a general characteristic of amides?high boiling pointsintermolecular hydrogen bonds are
A water solution contains molecule Z molecular weight 230 and NaCl. The solution is ionized with ESI method, as well as injected to a mass analyzer. In the collected mass spectrum what m/z peaks (value) might you expect to observe
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