Answer :
The enthalpy of the reaction can be obtained as 2.4 kJ/mol.
What is the enthalpy of reaction?
Enthalpy is a state function, meaning that it depends only on the initial and final states of the system, not on the path taken.
Number of moles of barium hydroxide = 65/1000 * 0.32 M
= 0.021 moles
Number of moles of HCl = 65/1000 L * 0.64 M
= 0.042 moles
If 1 mole of the hydroxide reacts with 2 moles of the HCl
0.021 moles of the hydroxide reacts with 0.021 * 2/1
= 0.042
Given that;
ΔH = mcdT
ΔH = (65 + 65) * 4.184 * (26.01 - 21.65)
= 2.4 kJ/ 1 mol
= 2.4 kJ/mol
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