The vapour pressure of water is given by$,$ in Psat $=$ A $-(5000/$T$),$ where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K$.$ The vapor pressure of water in atm. at $50$C is approximately

$0\mathrm{.}07$

$0\mathrm{.}09$

$0\mathrm{.}11$

$0\mathrm{.}13$