A researcher at McMurdo Station on Ross Island near Antarctica was conducting an experiment that involved collection of carbon dioxide gas by water displacement. It was a little chilly in the lab at the time of collection (16°C).

Allowing for the vapor pressure of water, what was the pressure of the CO2 collected? Use Table B-6 from the CRG

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Ответ:

katiebaby4109

12.12.2021

Chemistry

Refer to the diagram shown below.

The piston supports the same load W at both temperatures.
The ideal gas law is
pV=nRT

where
p = pressure
V = volume
n = moles
T = temperature
R = gas constant

State 1:
T₁ = 20 C = 20+273 = 293 K
d₁ = 25 cm piston diameter

State 2:
T₂ = 150 C = 423 K
d₂ = piston diameter

Because V, n, and R remain the same between the two temperatures, therefore
$\frac{p_{1}}{T_{1}} = \frac{p_{2}}{T_{2}}$

If the supported load is W kg, then
$p_{1} = \frac{W \, N}{ \frac{\pi}{4} d_{1}^{2}} = \frac{4W \, N}{\pi (0.25 \, m)^{2}} = 20.3718W \, Pa$
Similarly,
$p_{2} = \frac{4W}{\pi d_{2}^{2}} \, Pa$

$\frac{p_{1}}{p_{2}} = \frac{20.3718 \pi d_{2}^{2}}{4} = 16 d_{2}^{2}$

Because p₁/p₂ = T₁/T₂, therefore
$16d_{2}^{2} = \frac{293}{423} \\\\ d_{2}^{2} = \frac{0.6927}{16} \\\\ d_{2} = 0.2081 \, m$

The minimum piston diameter at 150 C is 20.8 cm.

20.8 cm diameter
If the cylindrical pistons are 25.000 cm in diameter at 20.0 ∘c, what should be the minimum diameter

If the cylindrical pistons are 25.000 cm in diameter at 20.0 ∘c, what should be the minimum diameter

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