Use the standard enthalpies of formation for the reactants and products to solve for the ΔHrxn for the following reaction. (The ΔHf of HCN is 108.9 kJ/mol, AgCl is -127.068 kJ/mol, HCl is -167.159 kJ/mol and AgCN is 146.0 kJ/mol.)

HCl (aq) + AgCN (s) HCN (aq) + AgCl (s)

ΔHrxn =

The reaction is

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15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.

What type of radiation is lead emitting in the following equation? alpha particles beta particles gamma rays