00:01
Let me write the target equation first of all.
00:03
The target equation we have is h2o solid to give h2o gas.
00:13
So we want to convert ice.
00:16
We want to calculate the enthalpy change converting ice into vapor form, water vapor form, right? so this is the required equation, the target equation.
00:27
So now consider the reactions we have given here.
00:30
Okay, we have given three equations three reactions.
00:34
So now by reaction three, okay, if you see the given third reaction, so that is what? that is h2o in liquid form to h2 in solid form, right? so, reversing that equation.
00:59
So that can be written as h2o in solid form, which gives h2o in liquid...