2. From the following enthalpy changes, calculate the value of AH° for the reaction
CuCl2 (s) + Cu (s) → 2CuCl (s).
Cu (s) + Cl2 (g) → CuCl2 (s)
2Cu (s) + Cl2 (g) 2CuCl(s)
AH° = -206 kJ
AH° = -136 kJ

Asolution has a ca2+ concentration of 0.049 m and an f- concentration is 0.147 m at equilibrium. the value of ksp for caf2 at 25°c is 4.0 x 10-11. will this solution form a precipitate? yes no

The enthalpy of formation of water is -285.8 kj/mol. what can be inferred from this statement?

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.