The volume of 
of water in the liquid state at 
is 
. The volume of of water vapour at and atmospheric pressure 
is 
.
Show that the work done against the atmosphere when of liquid water becomes water vapour is 
.
The first law of thermodynamics may be given by the expression
where 
is the increase in internal energy of the system. State what is meant by
: ..............................................................
: ..............................................................
The specific latent heat of vaporisation of water at is 
. A mass of of liquid water becomes water vapour at . Determine, using your answer in (a), the increase in internal energy of this mass of water during vaporisation.
