Consider an ionic compound, MXMX , composed of generic metal MM and generic, gaseous halogen XX . The enthalpy of formation of MXMX is ΔH∘f=−421ΔHf∘=−421 kJ/mol. The enthalpy of sublimation of MM is ΔHsub=155ΔHsub=155 kJ/mol. The ionization energy of MM is IE=401IE=401 kJ/mol. The electron affinity of XX is ΔHEA=−321ΔHEA=−321 kJ/mol. (Refer to the hint). The bond energy of X2X2 is BE=239BE=239 kJ/mol. Determine the lattice energy of MXMX .

(science)study the following ocean currents map. an ocean currents map is shown. on the map the locations for san diego, california and savannah, georgia are marked. there is a looping current from the north past san diego and a looping current from the south near savannah which statement is most likely correct about the average temperatures in san diego, california as compared to savannah, georgia? it is higher in savannah because of the cool ocean currents from the south. it is higher in savannah because of the warm ocean currents from the north. it is lower in san diego because of the warm ocean currents from the south. it is lower in san diego because of the cool ocean currents from the north.

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.

Oxygen undergoes an isentropic expansion from 120 degree c and 280 kpa absolute to 140 kpa absolute. determine the final temperature of the oxygen and the amount of work per kg of o_2 produced in the process if it is adiabatic.