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Determine the maximum fraction of the unit cell volumethat can be filled by hard spheres in the simple cubic structure. Assume that a is the lattice constant.
How many grams of water are needed to react with 75.0 g CaCN2?
Calculate the pH at the equivalence point if 25.00 mL of 0.010 M barbituric acid (HC4H3N2O3) is titrated with 0.20 M NaOH
Calculate the number of moles of NaOH required for the titration. Calculate the number of moles of HCl in hte HCl sample titrated.
a) decreasing the volume of a gas b) melting a solid c) chemical reactions that increase the number of moles of gas d) forming mixtures from pure substances e)increasing the temperature of a gas
If a solution is made by mixing 20.0mL .4M NaCH3COO with 30mL .4 CH3COOH, calculate the pH for acetic acid, Ka = 1.76x10^-5.
The chemical nature of an element is independent of A. its atomic number. B. the number of protons or electrons present in it. C. the number of neutrons present in it. D. none of these.
The Cl^- concentration in the water analysis given has been questioned. What concentration of Cl^- (mg/L) would make the cations and anions balance?
If the initial concentration of A=2.5 mol/L, the initial [B]=1.4 mol/L, and the rate =0.29 moles of product per liter per minute (M/min). Calculate the rate constant K to 2 decimal places.
the specific heat capacity of solid ice is 2.09 jgmiddotdegc and the specific heat capacity of liquid water is 4.18
Phosphate buffer has 3 ionizable groups, with pKa's of 2.15, 7.2, and 12.45. A 1.20 M solution of this buffer (250 mL) is found to have a pH of 6.0. A biochemist adds 30 mL of 1.0 M NaOH to this buffer. What is the resultant pH?
Estimate the value of the equilibrium constant at 625 {rm K} for each of the following reactions. Delta H{^{circ}_{rm f}} and S{^{circ}} for rm BrCl(g) is 14.6 {rm kJ/mol} and 240.0 frac {rm J}{rm mol cdot K}, respectively.
one kg of methane is contained in a pistoncylinder device at 0.8 mpa and 250 c. it undergoes a reversible isothermal
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