Iron is held at a temperature of 720°C. If the energy for vacancy formation is 1.08 eV/atom, calculate the number of vacancies in the iron at this temperature. * The density and atomic weight for Fe are 7.65 g/cm and 55.85 g/mol respectively

From the position of the element indium in the Periodic Table, predict the formula of its highest valency normal oxide. Select an answer from the list below. Select one: In2O3 InO₂ InO3 In205 InO Indium in your answer has a valency of 5. this is incorrect

Using the thermodynamic tables find the enthalpy of formation for BaCO3 (s) a. none of these b. – 1.29 x 103 kJ c. + 314.4 kJ d. – 1219 kJ e. – 628.8 kJ f. – 5.16 x 103 kJ g. – 314.4 kJ

The density of platinum is 21.45 g/cm3.  It crystallizes in a fcc lattice. Calculate its metallic radius.