273ml of a gas at S.T.P was taken to $27°\text{C}$ and 600mm pressure the final volume of the gas is

STP conditions            Given conditions

$P_1=1atm=760mm$        $P_2=\frac{600}{760}atm$

$T_1=273K$                          $T_2=27+273=300K$

$V_1=273ml$                          $V_2=?$

Combined gas equation

$\frac{{\text{P}}_{\text{1}}{\text{V}}_{\text{1}}}{{\text{T}}_{\text{1}}}=\frac{{\text{P}}_{\text{2}}{\text{V}}_{\text{2}}}{{\text{T}}_{\text{2}}}$

$\frac{760\times \cancel{273}}{\cancel{273}}=\frac{\stackrel{2}{\cancel{600}}\times {\text{V}}_{\text{2}}}{\cancel{300}}$

${\text{V}}_{\text{2}}=\frac{760}{2}$

$=380\text{mL}$ .

$\therefore$   The final volume of the gas is 380 ml