An equal volume of 1M HCl and 1M H2SO4 are neutralized by 1M NaOH solution and X and Y KJ/eq. of heat liberated respectively correct relationship is:-
HCl + NaOH → NaCl + H2O; ΔH1 = X KJ/eq
or H+ + OH– → H2O ; X KJ/eq .....(1)
H2SO4 + 2NaOH → NaSO4 + H2O; ΔH2 = Y KJ/eq
or 2H+ + 2OH– → 2H2O ; Y KJ/eq .....(2)
Since, equation (ii) is twice of equation (i) So, the relationship between enthalpies; 2X = Y
X = Y/2
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