wiz-icon
MyQuestionIcon
MyQuestionIcon
3
You visited us 3 times! Enjoying our articles? Unlock Full Access!
Question

The molar enthalpies of combusion of C2H2(g),C(graphite) and H2(g)are -1300,-394,-286 kJmol1 respectively. The standard enthalpy of formation of C2H2(g) is


A
-226 kJmol1
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
-626 kJmol1
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
226 kJmol1
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
626 kJmol1
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

The correct option is D 626 kJmol1
(i) C (graphite) +O2CO2394
(ii) H2+12O2H2O286
(iii) C2H2+52O22CO2+H2O1300
2 x (i) + (ii) + (iii)
2 C (graphite) +H2(g)C2H2
ΔH=2×394286+1300
ΔH=226KJ mol1

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Equilibrium Constants
CHEMISTRY
Watch in App
Join BYJU'S Learning Program
CrossIcon