Zn(s)+2HCl(aq)ZnCl2(aq)+H2(g) Part A Find H rxn for this reaction as written. (U

Question

Zn(s)+2HCl(aq)ZnCl2(aq)+H2(g)

Part A

Find Hrxn for this reaction as written. (Use 1.0 g/mL for the density of the solution and 4.18 J/gC as the specific heat capacity.)

Zinc metal reacts with hydrochloric acid according to the following balanced equation.

Zn(s)+2HCl(aq)ZnCl2(aq)+H2(g)

When 0.120 g of Zn(s) is combined with enough HCl to make 54.0 mL of solution in a coffee-cup calorimeter, all of the zinc reacts, raising the temperature of the solution from 22.1 C to 24.7 C.

Part A

Find Hrxn for this reaction as written. (Use 1.0 g/mL for the density of the solution and 4.18 J/gC as the specific heat capacity.)

Hrxn =   kJ/mol  

Explanation / Answer

mass of solution = (volume of solution)*(density of solution)
= 54.0*1.00
= 54.0 g

use,
(delta H)rxn = (mass of solution)*(specific heat capicity)*(T2 - T1)
= 54.0*4.18*(24.7 - 22.1)
= 54.0*4.18*2.60
= 586.9 J/mol
= 0.587 KJ/mol

Answer : 0.587 KJ/mol

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