Calculating Heat Produced in a Chemical Reaction

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SUMMARY

The discussion focuses on calculating the heat produced in a chemical reaction involving OCl– and Cl– ions, resulting in Cl2 and H2O, with a reaction enthalpy (ΔrH) of -202 kJ mol–1. Given a 25.0 mL solution at 0.400 mol L–1 concentration, the total moles of reactants are 0.0100 mol. The key to solving for q(system) in joules lies in recognizing that the heat produced can be calculated using the moles of Cl2 produced and the provided ΔrH, rather than relying on temperature changes or the q = mcΔT formula.

PREREQUISITES
  • Understanding of chemical reaction stoichiometry
  • Knowledge of enthalpy changes in reactions
  • Familiarity with the concept of heat transfer in thermodynamics
  • Basic calculations involving moles and molarity
NEXT STEPS
  • Calculate the total heat produced using the formula q = n × ΔrH
  • Explore the concept of enthalpy and its applications in thermochemical equations
  • Review the principles of calorimetry and heat capacity
  • Study the relationship between moles of reactants and products in chemical reactions
USEFUL FOR

Chemistry students, educators, and professionals involved in thermodynamics and chemical reaction analysis will benefit from this discussion.

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Homework Statement


OCl–(aq) + Cl–(aq) + 2H+(aq) Cl2(aq) + H2O ΔrH = -202 kJ mol–1
25.0mL of a solution 0.400mol L–1 in both OCl– and Cl– was reacted with excess hydrochloric acid. The mass of the solution after mixing was 100 g.
n(reaction) = 0.0100 mol

Find q(system) in joules.
Assume that the temperature change of the vessel in which the experiment is carried out is negligible
Assume that the heat capacity of the mixture is the same as the specific heat capacity of water (4.184 J g–1 K–1).

Homework Equations

I know somewhere you have to use the formula q = mcΔT but I am unsure what to do because there is no temperature in the question.

The Attempt at a Solution



I have tried multiplying the mass and temp change but I think i am wrong. Please help?
 
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It is not about q = mcΔT.

You are told how much heat is produced per mole of produced Cl2. How many moles were produced?
 

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