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45 ml of 0.0325 M HCN solution is titrated with 0.0200 M NaOH solution.( Ka of HCN =6.2 x 10 power - 10 )

1) calculate volume of NaOH used in titration in order to reach equivalence point ?

2) What is the pH of the solution at equivalent point ?

3) What is molar concentration of CN- at equivalent point ?

KClO3-------KCl + O2

The oxygen produced was collected by displacemnt of water at 22C at a total pressure of 554 torr. The volume of the gas collectedwas 1.65 L, and the vapor pressure of water at 22C is 21 torr.

Calculate the partial pressure of O2 gas collected and the mass of KClO3 of the sample that was decomposed.

please answer as early as possible

The vapor presurre of mercury is 0.00185 mmhg at 25 degree C. A single drop of Hg(0.1 mL) is spilled in a laboratory of dimensions 10m x 10m x3m. Does the entire drop evaporate? What is the partial pressure of Hg in the laboratory? (Use 13.6 g/ml for the density of Hg.) (b) The normal boiling point of mercury is 630 K. Caluculate an approimate value for vapor pressure.

The vapor presurre of mercury is 0.00185 mmhg at 25 degree C. A single drop of Hg(0.1 mL) is spilled in a laboratory of dimensions 10m x 10m x3m. Does the entire drop evaporate? What is the partial pressure of Hg in the laboratory? (Use 13.6 g/ml for the density of Hg.) (b) The normal boiling point of mercury is 630 K. Caluculate an approimate value for vapor pressure.