Calculate the enthalpy of change, Delta H of rxn, for each of the reactions. record the values in the data table part 2
I calculated the heat of rxn of the HCl +NaOH------NaCl + H2O. How do i go from here to enthalpy of change
You have q. Then delta H = q/grams or q/moles depending upon the units you want for the answer.
Dr.Bob222, so, i had to use 50 mL of HCL and NaOH. (2M), so i would do Qrxn/0.1 mol
Yes, that will give you delta H in J/mol or cal/mol. Most of the time these are expressed as kJ/mol or Kcal/mol.
To calculate the enthalpy of change, ΔH, for a reaction using the heat of reaction, you will need to consider the stoichiometry of the reaction and any other relevant information.
In the case of the reaction HCl + NaOH → NaCl + H2O, if you have already calculated the heat of reaction, you can use that value to determine the enthalpy of change.
First, you need to recall the stoichiometry of the reaction. Looking at the balanced equation, you can see that one mole of HCl reacts with one mole of NaOH to produce one mole of NaCl and one mole of H2O. This means that the heat of reaction you calculated corresponds to the enthalpy change for one mole of the reaction.
To determine the enthalpy of change, you need to divide the heat of reaction by the number of moles of the limiting reactant involved in the reaction. The limiting reactant is the substance that is completely consumed in the reaction and determines the maximum amount of product that can be formed.
Let's say, for example, you have calculated the heat of reaction to be -50 kJ/mol. If you know that in your reaction HCl is the limiting reactant and you started with 2 moles of HCl, you would divide the heat of reaction by 2 to obtain the enthalpy of change per mole of HCl. In this case, ΔH would be -25 kJ/mol.
Remember to consider the proper sign convention for exothermic (-) and endothermic (+) reactions when interpreting the result.
Do the same calculation for each reaction in your data table, taking into account the stoichiometry and the moles of the limiting reactant. This will allow you to calculate the enthalpy of change for each reaction.