HCl(aq) + KOH(aq) --------> KCl(aq) + H2O(l)
45 ml 55ml
0.2 molar 0.2 molar
0.2 × 45/1000 0.2 ×55/1000
0 0.2 ×10/1000 0.2×45/1000 0.2×45/10^3
Volume of the solution is 100 ml.
Density of the solution is 1gm/ml.
Mass of the solution(m) is 100gm.
"C=4.2J\/g.K"
"Tf=294.69 K"
"Ti =293.5 K"
"Qabs by solution = m\u00d7C\u00d7change in T"
"Qabs by solution = 100g \u00d74.2J\/g.K\u00d71.19K"
"Qabs by solution = 499.8 J"
"Qreaction = -Qabs by solution=-499.8J"
"enthalpy change\/mole of water =Qreact\/moles"
"enthalpy change= -499.8 J\/(0.2\u00d745\/1000)mol"
"enthalpy change= - 55.53\u00d7 10^3 J\/mol"
"enthalpy change= -55.53KJ\/mol" (Ans)
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