What is the correct enthalpy diagram using the hess law for this system?

Jose and eric were given four samples in lab. the results of their analysis are shown in the table. based on the data they collected, which sample is most likely a metal?

Select all that apply. using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 (s) pb+2(aq) + 2cl -(aq). the concentration of the products yield a ksp of 2.1 x 10-2:

Areaction is first order with respect to reactant x and second order with respect to reactant y. which statement describes the rate law for this reaction?