Sketch the pressure/temperature phase diagram for H2O. Define phase, component and variance. Write the Gibbs’ phase rule. Indicate the line at p = 1 atm. Indicate the number of components and all the regions with different number of phases and different variance.

The Gibbs energy of mixing of a regular solution of components A and B is given by Greal = nRT (x Inx +x Inx +ẞXX), where X and X are mix A B B A B the mole fractions of the two components and ẞ is a dimensionless parameter quantifying deviations from ideal behaviour in terms of the relative strength of A-B interactions compared to A-A and B-B interactions. (i) Use a spreadsheet to calculate A Greal/nRT for XA = 0.01, 0.125, mix 0.25, 0.5, 0.75, 0.875 and 0.99 for ẞ= 0, 1 and 3. Report your calculations in a table and, using a labelled plot, determine the numbers of minima in A Greal/nRT as a function of composition and ẞ. mix [3 (ii) For each value of ẞ, predict the number of liquid phases which you would expect for the mixture. Justify your answer in terms of A-B interactions. [

In the following balanced reaction: 2Al(s) + 6HCl(aq) → 2AlCl3(s) + 3H2(g) 2.32 g of Al react with excess HCl to produce hydrogen gas which is passed through water and collected at 25oC and a barometric pressure of 7.40 x 102 Torr. The vapour pressure of water at 25oC is 23.770 Torr. Calculate the partial pressure of hydrogen gas.

One of the more commonly used compressed gases is nitrogen (N2), often in large metal cylinders. If a cylinder holds 711 mol of N2 when pressurised to 5.3 x 104 kPa at T = 20oC, how many litres is its capacity?

(a) Identify the major phases (ice, water, vapor) on the unary phase diagram of H2O below.

For the following reactions, predict whether the mole fraction of the reactants or products increases or remains the same when the volume of the reaction vessel is increased. SO2 (9) + 1/2 0, (9) = SO3 (g) а. mole fraction of reactants increases mole fraction of products increases mole fraction remains the same 2 CH4 (g) = C2H2 (g) + 3 H2 (g) b. mole fraction of reactants increases mole fraction of products increases Omole fraction remains the same N2 (9) + 2 O2 (9)=2 NO2 (g) с. mole fraction of reactants increases mole fraction of products increases Omole fraction remains the same

3.

-0123456789+ -μθοβπΣτ' σΔαχψ -0123456789+ Write an equation for the formation of Cu20(s) from its elements in their standard states. Express your answer as a chemical equation. Identify all of the phases (e.g. (s), (I), (g) ) in your answer. Make sure your answer does not include any spaces! Enter fractions using the "/" symbol (e.g. 1/2). Answer:

Part G Pt(s) |O₂(g) H+ (aq)||OH(aq) |O₂(g) Pt(s) Express your answer as a net ion equation. Identify all of the phases in your answer. Part H | ΑΣΦ A chemical reaction does not occur for this question. Submit Request Answer cell Calculate Ecell for the reaction in part G. Express your answer to three decimal places and include the appropriate units. HA ? Value Units ?