URGENT What is the AH soi for LiBr - Li+ + Br-? The lattice energy is –734 kJ/mol, the enthalpy of hydration for Lit is -499 kJ/mol, and the enthalpy of hydration for Br- is –284 kJ/mol. Use AH sol = -AHiat + AHhydr.
A. -519 kJ/mol
B. -49 kJ/mol
C. 49 kJ/mol
D. 1,517 kJ/mol
IT'S NOT A!!!

Compounds a and b react to form compounds c and d according to the equation: aa + bb → cc + dd. under which conditions will the rate law be given by the equation: rate = k[a]a[b]b? a. the reaction takes place in one step. b. the reaction is endothermic. c. the reaction is exothermic. d. the reaction involves more than one step.