Home
Class 12
CHEMISTRY
{:(H(2)+1//2O(2) rarr H(2)O, ,,DeltaH^(T...

`{:(H_(2)+1//2O_(2) rarr H_(2)O, ,,DeltaH^(Theta) =- 68 kcal),(K +H_(2)O +aq rarr KOH (aq) +1//2H_(2),,, DeltaH^(Theta) = - 48 kcal),(KOH+aq rarr KOH(aq),,,DeltaH^(Theta)=-14kcal):}`
From the above data, the standard heat of formation of `KOH` in kcal is

A

`+102.83`

B

`+130.85`

C

`- 102.83`

D

`- 130.85`

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Similar Questions

Explore conceptually related problems

If {:(H_(2)+1//2O_(2)rarrH_(2)O",",,,,DeltaH= -68 kcal),(K+H_(2)OrarrKOH(aq)+1//2H_(2)",",,,,DeltaH= -48 kcal),(KOH+"water"rarrKOH(aq)"," ,,,,DeltaH= -14 kcal):} Find the heat of formation of KOH . Find the heat of formation of KOH .

If H_(2)+1//2O_(2)rarr H_(2)O , Delta =-68.39 Kcal K+H_(2)O+ "water" rarr KOH(aq)+1//2H_(2) , Delta H=-48.0 Kcal KOH+"water" rarr KOH(aq)Delta H=-14.0 Kcal the heat of formation of KOH is -

C_(2)H_(2) + 5/2 O_2(2) rarr 2CO_(2) + H_(2)O , Delta H = -310 kcal C + O_(2) rarr CO_(2) , " "Delta H = -94 kcal H_(2) + 1/2 O_(2) rarr H_(2)O, " " Delta H = -68 kcal On the basis of the above equations, DeltaH_(f) (enthalpy of formation) of C_2H_2 will be :

The reaction given below BaCl_(2)(s) +2H_(2)O(l) rarr BaCl_(2).2H_(2)O,DeltaH^(Theta) =- x kJ The value of DeltaH^(Theta) represents

H_(2)O(s) rarr H_(2)O(l), DeltaH = 6.01 kJ DeltaH is the heat of …………………of ice.

H_(2)O(l) rarr H_(2)O(s), DeltaH =- 6.01 kJ DeltaH is the heat of ……………….of water.

H_(2)O(g) rarr H_(2)O(l), DeltaH =- 40.7 kJ DeltaH is the heat of……………….of water.

Given that: i. C(s) + O_(2)(g) rarr CO_(2)(g) , DeltaH =- 94.05 kcal ii. H_(2)(g) +(1)/(2) O_(2)(g) rarr H_(2)O(l), DeltaH =- 68.32 kcal iii. C_(2)H_(2)(g) +(5)/(2) O_(2)(g) rarr 2CO_(2)(g) +H_(2)O(l), DeltaH =- 310.62 kcal The heat of formation fo acetylene is

Given that: i. C(s) + O_(2)(g) rarr CO_(2)(g) , DeltaH =- 94.05 kcal ii. H_(2)(g) +(1)/(2) O_(2)(g) rarr H_(2)O(l), DeltaH =- 68.32 kcal iii. C_(2)H_(2)(g) +(5)/(2) O_(2)(g) rarr 2CO_(2)(g) +H_(2)O(l),DeltaH =- 310.62 kcal The heat of formation fo acetylene is

CsOH +HCI rarr CsCI +H_(2)O, DeltaH =- 13.4 kcal mol^(-1)……….(i) CsOH +HF rarr CsF +H_(2)O, DeltaH =- 16.4 kcal mol^(-1) ………(ii) Calculate DeltaH for the ionisation of HF in H_(2)O .