## Kc

The equilibrium constant for the reaction H2(g) + I2(g) <-> 2HI(g) is 60 at 723K. What is the number of moles of HI in equilibrium with 2 mol of H2 and 0.3 mol of I2 at 723K?

## Boiling Points

Describe and explain the variation in boiling point of the gases Hydrogen Fluoride, Hydrogen Chloride, Hydrogen Bromide and Hydrogen Iodide.

## Bond Energy

Water gas, a mixture of Carbon Monoxide and Hydrogen, is prepared by passing Steam over heated Carbon. Energy is absorbed during the process. i) Is the process Endothermic or Exothermic? ii) Construct a balanced equation for this reaction. iii) Calculate

## Ksp

If you have a solution that is 0.10 mol/dm3 in both Ba2+ and Ca2+. CaF2 will begin to precipitate first as fluoride ion is added slowly to the solution. i) What concentration of fluoride ion will precipitate the maximum amount

## Stoichiometry

You have 1.249 g of mixture of NaHCO3 and Na2CO3. You find that 12.0 cm3 of 1.50 mol/dm3 HCl is required to convert the sample completely to NaCl , H2O and CO2. NaHCO3 + HCl -> NaCl + H2O +

## pH Calculation

At 298K, the value of Ka of Ethanoic Acid in aqueous solution is 1.74 x 10^-5 mol/dm3 i) Calculate the pH of 0.410 mol/dm3 Ethanoic Acid in this temperature. ii) Calculate the pH of the buffer solution formed when 10

## Ionisation Energies

In the first row of the d-block elements from Scandium to Zinc, apart from Zinc, all the elements have fairly similar 1st IE despite the number of protons increasing across the series. Explain why the trend and the exception of

## Bond Length

Explain why the bond length of the following compounds is as followed: HF 92pm HCl 127pm HBr 141pm HI 161pm

## Kp Calculation

When 0.0322 mol of NO and 1.70g of bromine are placed in 1.00L of reaction vessel and sealed, the mixture reacts and the following equilibrium is established: 2NO(g) + Br2(g) <-> 2NOBr(g) At 25ºC, equilibrium of NOBr is 0.438 atm.