Question

reacts with hydrochloric acid according to the fol- 3. Zinc metal reacts with hy lowing balanced equation: Zn(s) + 2 HCl(aq) → ZnCl2(aq) + H2(8) When 0.103 g of Zn(s) is combined with enough HCl to make 500 mL of solution in a coffee-cup calorimeter, all of the zinc reacts, raising the temperature of the solution from 22.5 °C to 23.7 °C. Find A H for this reaction as written. (Use 1.0 g mL- for the density of the solution and 4.184 J g °C as the spe- cific heat capacity.)

Answer 1

Density = mass/ volume mass Densite x volume - 50 ml x 1g/ml - 50g 9 = mcAT 9 = heat absorbed (released me mass sog e = specific heat capacity LAT change in Remperature - 23.70% - 22-5"ch 2 4.184 F/g °C 9 19 - 50q X 4:184 JL9°C-X1'2°C 251-040 number of moles : mass /molar mass males of Zene : 0-1039 / 65.419/ mal = 0.0075 mol Лои АН = 2 a no. of males M = 251.04 J o.ools 7 mol AM = 159 898 09 Jl mal OH = 159.9 kJ/mol