# Questions tagged [pressure]

For questions about gas pressure, or the effect of pressure in general on chemical species, substances, or reactions.

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### Mass Transfer- Film Theory and Membrane Separation [closed]

There's a question that I've been stuck on for quite some time- can someone help me out? A polymer membrane which is permeable to oxygen but impermeable to nitrogen is available. It is desired to use ...
83 views

### If I make CO2 by exposing CaCO3 to HCl, how much of it would be dissolved in the water [closed]

For an experiment we're trying to measure the amount of gas produced in this reaction. But we always find less gas then expected, then a colleague told me that it could be because some of the CO2 ...
432 views

### Heat capacity of (ideal) gases at constant pressure

I've come across this article which says that the constant pressure heat capacity is independent of pressure. It also gives a mathematical explanation which says that any work of an ideal gas at ...
62 views

### Is fugacity the corrected pressure that should be used in thermodynamical models?

I am a little confused about fugacity and pressure of a gas. In ideal gases, pressure is same as fugacity. But for real gases this is not the case. Here is the link of the question that is the source ...
1 vote
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### Heat increase after pressure drop in polymer filter

I would like to calculate the heat increase in polymer filter. A polymer filter (mesh size p.ex.20 µm) decreases the mass pressure of the polymer flow. How it works: The polymer is melted in an ...
72 views

### Pressure before equilibrium = Pressure during equilibrium?

For example, let's say we have the equation $$\ce{PCl_3(g) + Cl_2(g) -> PCl_5(g)},$$ and the temperature is held constant. Would the pressure in the container when equilibrium is reached be greater ...
967 views

### Do gas particles colliding with each other affect the overall pressure?

Gas pressure is the pressure exerted by gas particles when they collide with the walls of the container. The gas pressure increases with the number of gas particles. Does the collision between two gas ...
106 views

### Why is there a limit to the amount of water vapor in the air even though the atmosphere is so vast? [closed]

I have read that temperature and pressure dictate how much water vapor can exist in the air. Air is a mixture, so shouldn’t the addition of water vapor just add to the mixture regardless the ...
153 views

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### Vapor Pressure of reaction mass undergoing an exothermic reaction

A vessel containing a reaction mass under going an exothermic reaction is under vacuum, with temperature and pressure constant. When the source of vacuum is closed, the reactor begins to increase ...
150 views

### When does a piston stop in an irreversible process?

Suppose we have an ideal gas filled inside a container fitted with a piston. The external pressure is equal to internal pressure. If we suddenly decrease the external pressure, we say that the gas ...
309 views

### Pressure of two flasks connected to each other at different temperatures [closed]

Two flasks of equal volume connected by a narrow tube (of negligible volume) are at $\pu{27 °C}$ and contain $\pu{0.7 mol}$ of $\ce{H2}$ at $\pu{0.5 atm}$. If one of the flasks is then immersed into a ...
374 views

### Relative humidity and vapor-pressure in equilibrium

I have quite an unclear understanding of relative humidity. I am writing my understanding on the topic and please correct me wherever I'm wrong: What I understood: Let's say $\ce{H2O}$ has a (...
60 views

### Osmotic Pressure of Aqueous Solution

The osmotic pressure of an aqueous solution at $25$ Celsius is $92.0$ $kPa$. Calculate the boiling point of the solution. (Assume that the density of the solution is $1.0$ $g/mL$, ignore the mass of ...
The following question has troubled me for a while. For gases that are slightly soluble in water, there is a proportional relationship between the partial pressure, $P$, and the mole fraction, $x$, ...