Consider an ionic compound, mx2, composed of generic metal m and generic, gaseous halogen x.
the enthalpy of formation of mx2 is δhf° = –799 kj/mol.
the enthalpy of sublimation of m is δhsub = 157 kj/mol.
the first and second ionization energies of m are ie1 = 785 kj/mol and ie2 = 1451 kj/mol. the electron affinity of x is δhea = –349 kj/mol.
the bond energy of x2 is be = 157 kj/mol. determine the lattice energy of mx2.

Un cierto gas tiene un volumen de 800ml a 80°c y 600ml a 80°c y 600mmhg de presión. ¿cual será el volumen del gas a condiciones normales? sí el gas es oxígeno, ¿cuál será su peso? y ¿cuántas moléculas están presentes en el sistema?

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?