calculate ph - Calculate the pH of a buffer solution that contains 0.25 mol benzoic acid (C6H5COOH) / Litre and 0.15 mol sodium benzoate (C6H5COONa) / Litre. [ Ka = 6.5 x 10-5 for benzoic acid]

weak acid strong base - Weak Acid - Strong Base Titration. a 50.0-mL portion of 0.200 M HCOOH has been titrated with 0.200 M KOH to the equivalence point. What is the pH at the equivalence point?

molarity - What is the Molarity of a solution of 10% by mass cadmium sulfate, CdSO4 (molar mass = 208.46 gram/mol)? The density of the solution is 1.10 g/ml. Show work and thanks for your time and help.

equilibrium constant - 1.25 moles of NOCL were placed in a 2.50L reaction chamber at 427 degrees celcius. After equilibrium was reached, 1.10 moles of NOCL remained. Calculate the equilibrium constant, K subletter c, for the reaction 2NOCL(g) = 2NO(g) + CL subnumber2(g). The equal is acually two arrows pointing in opposint directions, please show steps, thanks

4 element oxygen - The element oxygen was prepared by Joseph Priestley in 1774 by heating mercury(11)oxide: HgO(s)->Hg(l) + (1/2)O2(g) delta H = 90.84 KiloJoule/mol S(Hg)=76.02 J/K x mol S(o2)=205.0 J/K x mol s(HgO) =70.29 J/k x mol Estimate the temperature at which this reaction will become spontaneous under standard state conditions. Show all work and steps to the problem. If y...