Question

68. What is enthalpy change when 100 mL of 1 M H2SO4
is completely neutralized by 100 mL of 1M Ca(OH)2 ?
(a) -13.7 kcal
(b)-27.4 kcal
(c)-1.37 kcal
(d) -2.74 kcal​

Answer 1

Dear Student,

◆ Answer - (d)

∆H = -2.74 kcal

● Explaination -

Moles of H+ are -

n(H+) = 2 × 100/1000 × 1

n(H+) = 0.2 mol

Moles of H+ are -

n(OH-) = 2 × 100/1000 × 1

n(OH-) = 0.2 mol

Standard enthalpy change for neutralisation for neutralisation of H2SO4 and Ca(OH)2 is -13.7 kcal/mol.

Hence, enthalpy change betwn the reaction will be -

∆H = 0.2 × -13.7

∆H = -2.74 kcal

Therefore, enthalpy change betwn the reaction will be -2.74 kcal.

Hope that helps...