Question

1. Zinc metal reacts with hydrochloric acid according to the following balanced equation. Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g) When 0.106 g of Zn(s) is combined with enough HCl to make 50.1 mL of solution in a coffee-cup calorimeter, all of the zinc reacts, raising the temperature of the solution from 21.9 ∘C to 24.6 ∘C.

Part A Find ΔHrxn for this reaction as written. (Use 1.0 g/mL for the density of the solution and 4.18 J/g⋅∘C as the specific heat capacity.) ΔHrxn ΔHrxn = nothing   kJ/mol   Submit

2. The addition of hydrochloric acid to a silver nitrate solution precipitates silver chloride according to the reaction:

AgNO3(aq)+HCl(aq)→AgCl(s)+HNO3(aq)

When 50.0 mL of 0.100 M AgNO3 is combined with 50.0 mL of 0.100 M HCl in a coffee-cup calorimeter, the temperature changes from 23.40 ∘C to 24.21 ∘C.

Part A

Calculate ΔHrxn for the reaction as written. Use 1.00 g/mL as the density of the solution and Cs=4.18J/(g⋅∘C) as the specific heat capacity of the solution.

Express the energy to two significant figures and include the appropriate units.

ΔHrxn ΔHrxn =	nothingnothing