# A 260 L kiln is used for vitrifying ceramics. It is currently operating at 1235 °C and the pressure is 1.025 atm. How many moles of air molecules are within the confines of the kiln?

Approx. $2$ $m o l$.
We use the Ideal Gas Equation, and solve for $n$.
$n = \frac{P V}{R T} = \frac{1.025 \cdot a t m \times 260 \cdot L}{0.0821 \cdot L \cdot a t m \cdot {K}^{-} 1 \cdot m o {l}^{-} 1} \times \frac{1}{1508 K}$
$=$ ??" mol?"