The absolute enthalpy of neutralisation of th | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The standard enthalpy of neutralisation for a strong acid and a strong base is $-57.33 \ kJ \ mol^{-1}$.$MgO$ is a metal oxide that acts as a base

Vedclass · Accepted Answer

Less than $-57.33 \ kJ \ mol^{-1}$

Vedclass · Answer

(A) The standard enthalpy of neutralisation for a strong acid and a strong base is $-57.33 \ kJ \ mol^{-1}$.$MgO$ is a metal oxide that acts as a base,but it is not a strong soluble base like $NaOH$ or $KOH$.When $MgO_{(s)}$ reacts with $HCl_{(aq)}$,energy is consumed to break the crystal lattice of $MgO$ and to convert it into ions.Therefore,the net heat released is less than the standard value of $-57.33 \ kJ \ mol^{-1}$ (i.e.,it is less exothermic).Thus,the enthalpy of neutralisation will be less than $-57.33 \ kJ \ mol^{-1}$.

The absolute enthalpy of neutralisation of the reaction $MgO_{(s)} + 2HCl_{(aq)} \to MgCl_{2(aq)} + H_2O_{(l)}$ will be

Similar Questions

Which of the following reactions satisfies the following conditions?
$(a)$ Heat of combustion reaction
$(b)$ Heat of formation reaction
$(c)$ An exothermic reaction
$(d)$ Not a neutralization reaction

When $0.5 \ mol$ of $HNO_3$ reacts with $0.2 \ mol$ of $KOH$,the heat of neutralization is equal to ...... $kJ$.

If the heat of neutralization of an acid-base reaction is $56 \ kJ \ mol^{-1}$,then the substances could be:

Find the value $\Delta H_f^o[NH_{3(g)}]$ if $\Delta H_r$ for the reaction $N_{2(g)} + 3H_{2(g)} \to 2NH_{3(g)}$ is $-\,183.6 \ kJ/mol$ of $N_{2(g)}$.

Which of the following substances has the highest value of standard molar enthalpy of formation at $298 \ K$?

Vedclass Test Series

Exam Paper Generator

Online Exam Module