Home
Class 12
CHEMISTRY
Given : (i) C("graphite") +O2(g)toCO2(...

Given :
(i) `C("graphite") +O_2(g)toCO_2(g)DeltarH^(Theta)="x kj "mol^(-1)`
(ii)`C("graphite") +(1)/(2)O_2(g)toCO_2(g),DeltarH^(Theta)="y kj "mol^(-1)`
(iii) `CO(g) +(1)/(2)O_2(g) toCO_2(g),DeltarH^(theta)="zkj" mol^(-1)`
Based on the above thermochemical equations, find out which one of the following algebraic relationships is correct ?

A

z = x + y

B

y = 2z - x

C

x = y - z

D

x = y + z

Text Solution

Verified by Experts

The correct Answer is:
D
Reaction (3) = reaction (1) - (2)
`Delta H_(3) = Delta H_(1) - Delta H_(2)`
`z = x - y`
`x = z + y`
Promotional Banner

Similar Questions

Explore conceptually related problems

Given : (i) C("graphite") + O_(2)(g) rarr CO(g) ,Delta_(r )H^(@) = xkJ mol^(-1) (ii) C("graphite") + 1/2 O_(2)(g) rarr CO_(2)(g), Delta_(r )H^(@) = ykJ mol^(-1) (iii) CO(g) + 1/2 O_(2)(g) rarr CO_(2)(g) , Delta_(r )H = z kJ mol^(-1) Based on the above thermochemical equations, find out which one of the following algebraic relationships is correct ?

Given C_(("graphite"))+O_(2)(g)toCO_(2)(g), Delta_(r)H^(0)=-393.5kJ" "mol^(-1) H_(2)(g)=+(1)/(2)O_(2)(g)toH_(2)O(1), Delta_(r)H^(0)=-285.8" kJ "mol^(-1) CO_(2)(g)+2H_(2)O(1)toCH_(4)(g)+2O_(2)(g) , Delta_(r)H^(0)=+890.3kJ" "mol^(-1) Based on the above thermochemical equations, the value of Delta_(r)H^(0) at at 298 K for the reaction C_(("graphite"))+2H_(2)(g)toCH_(4)(g) will be: