Question

if 25 kernels of popcorn have a volume of 1.5 mL and release .25 moles of water, what pressure is needed to pop them? The oil boils at 225 Celsius

Answer 1

Givens.

• Volume = 1.5 mL.

,

• Moles = 0.25 moles.

,

• Temperature = 225 Celsius.

First, transform the volume into L.

`1.5mL\cdot(1L)/(1000mL)=0.0015L`

Then, use the ideal gas law and solve for P.

`\begin{gathered} PV=\text{nRT} \\ P=\frac{\text{nRT}}{V}=\frac{0.25\text{mol}\cdot0.08206\cdot\frac{L\cdot\text{atm}}{mol\cdot K}\cdot498.15K}{0.0015L} \\ P=6813.03atm \end{gathered}`

Therefore, the pressure is 6813.03 atm.