wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

The enthalpy of vapourisation of liquid water using the data
H2(g)+12O2(g)H2O(l);ΔH=285.77KJmol1
H2(g)+12O2(g)H2O(g);ΔH=241.84KJmol1

A
+43.93 KJ mol1
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
-43.93 KJ mol1
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
+527.61 KJ mol1
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
-527.61 KJ mol1
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is A +43.93 KJ mol1
The thermochemical reactions are as given below.
H2(g)+12O2(g)H2O(l);ΔH=285.77KJmol1 ......(1)
H2(g)+12O2(g)H2O(g);ΔH=241.84KJmol1 ......(2)
The reaction (1) is reversed and added to the reaction (2) to obtain the reaction for the vapouisation of liquid water which is H2O(l)H2O(g)
Hence, the heat of vapourisation of liquid water is 241.84+285.77=43.93KJmol1

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