The pressure exerted by a non-reactive gaseous mixture of 6.4 g of methane and 8.8 g of carbon dioxide in a 10 L vessel at $27^{\circ} \mathrm{C}$ is $\_\_\_\_$ kPa . (Round off to the Nearest Integer). [Assume gases are ideal, $\mathrm{R}=8.314 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}$ Atomic masses : $\mathrm{C} \cdot 12.0 \mathrm{u}, \mathrm{H}: 1.0 \mathrm{u}, \mathrm{Q}: 16.0 \mathrm{u}$ ]