Solid Au-Cu alloys areregular intheir thermodynamic behaviour. The integral enthalpy of mixing, ΔΗ , at 447°C (720 K) is given below as a function of composition. xCu : ΔΗΜ, cal/mole : 0.2 0.3 -585 -850 0.4 -1075 -4498 0.5 -1220 -5104) 4 (kïf , J/mol : -2448 -3556

Calculate the equilibrium composition of a Cu-Ni alloy (in wt%) capable of existing in equilibrium with CU2O and NiO at 727°C (1000 K) from the following data: At 727°C (lOOOK) - AG°Cu Q = -18,230 cal/mole (-76,274 J/mol), and AG°Ni0 = ~ 3 0 » 1 5 0 cal/mole (-126,148 J/mol). Atomic weights of Cu and Ni are 63.54 and 58.7 respectively.

Is it possible to have a copper–nickel alloy that, at equilibrium, con-sists of an a phase of composition 37 wt% Ni–63 wt% Cu and also a liquid phase of composition20 wt% Ni–80 wt% Cu? If so, what will be the approximate temperature of the alloy? If this isnot possible, explain why

Two aircraft rivets, one of iron and the other of copper, are placed in a calorimeter that has an initial temperature of 10°C. The data for the metals are as follows:Mass g Initial T°CIron 40.0 0.0Copper 12.0 100.0Note: Reference the Phase change properties of pure substances table for additional information.Part: 0 / 30 of 3 Parts CompletePart 1 of 3Will heat flow from Fe to Cu or from Cu to Fe? Check all that apply.

2Cu+ (aq) → Cu (s) + Cu+ (aq) 2Cu+ (𝑎𝑞) → Cu (𝑠) + Cu+ (𝑎𝑞) is +0.36 V at 298 K. The equilibrium constant of the reaction is

What type of bonding exists in Cu?