I must not be doing this right because I'm not getting any of these answers. please help! :(
The problem:
The lattice enthalpy of AgF is 971 kJ*mol and the hydration enthalpy is -993kJ *mol. Estimate the enthalpy of solution AgF.
A) -993kj*mol
B) -971 kj*mol
C) -1964kj*mol
D) +22kj*mol
E) -22kj*mol
2007-09-19 15:06:29 · 2 answers · asked by ___ 1 in Science & Mathematics ➔ Chemistry
The lattice energy is the energy required to separate the ions of the solid AgF. The hydration energy is what is released when those ions dissolve in water. The enthalpy of solution is the energy change when AgF dissolves directly. If you consider the energy diagram, the lattice energy will be an arrow pointed upward and the hydration energy will be downward. The enthapy of solution is a single arrow from the starting point of the solid to the ions in solution.
Just add those two values together to get the enthalpy of solution.
971 jK/mol +(-993 kJ/mol) = -22 kJ/mol
2007-09-19 15:12:58 · answer #1 · answered by hcbiochem 7 · 0⤊ 0⤋
its easy. when a substance dissolves 2 things are actually happening. first of all the bond between the Ag-F is breaking and there is some energy absorbed in the process. i dont know if its +ve or -ve. then when the Ag and F atoms form ions ie dissolve to form a solution there is some heat given off/absorbed. so to find the enthalpy of solution you simple add up the latice enthalpy and hydration enthallpy. right now i'm not sure of the signs of the digits. lol. guys do correct me if i'm wrong!!1
2007-09-19 15:15:25 · answer #2 · answered by Anonymous · 0⤊ 0⤋