All Questions
75 questions
4
votes
2
answers
572
views
Calculating pressure inside a bag using the ideal gas laws
I was doing an experiment to inflate a bag using CO2 produced from a reaction between baking soda and vinegar. I came up with a balanced chemical equation and used the ideal gas law to calculate the ...
- 49
-1
votes
1
answer
158
views
Why is the relationship between vapour pressure and boiling point of water non-linear?
From my rudimentary understanding of chemistry, pressure should be directly proportional to temperature for a constant mass of gas under the same volume (Charles’s law).
However, in the diagram above,...
- 309
2
votes
0
answers
52
views
Validity of ideal gas law for pure species or mixture
I'm currently dealing with an application involving gases. I have pure nitrogen as a pressurizer and eventually water vapour (only if condition for evaporation or boiling are met).
I wanted to ask to ...
- 33
-1
votes
1
answer
338
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 ...
- 11
1
vote
1
answer
135
views
How do I go about calculating final temperature of tank draining at saturation?
I am working on calculating pressure in a tank where the fluid is sitting at its vapor pressure. For example, imagine a 12 in diameter 100 L tank of nitrous oxide at room temperature (745 psi vapor ...
9
votes
1
answer
804
views
Confusion in Van der Waals Equation
I understand that the behavior of ideal gases deviates largely from that of real gases in terms of pressure exerted by the gas molecules on the container in which it is present, space available for ...
- 121
3
votes
2
answers
362
views
Why does van der Waals' equation of state give only one P, V pair for a particular temperature here?
I came across this question which I initially ignored believing that the data was insufficient:
Calculate the pressure exerted by one mole of $\ce{CO2}$ gas at $\pu{273 K}$ if the van der Waals' ...
- 963
-3
votes
1
answer
549
views
How to calculate Kp without knowing the volume? [closed]
I have the following chemical equation:
$$\ce{Sb2S3 + 3H2 <=> 2 Sb + 3H2S}$$
I have $\pu{1000 grams}$ of $\ce{Sb2S3}$ that reacts with $\pu{10 grams}$ of $\ce{H2}$ in a reactor at $\pu{713 K}$.
...
0
votes
1
answer
454
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 ...
- 19
0
votes
1
answer
2k
views
Dissolution of CO2 in water
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, $x$, ...
- 605
2
votes
1
answer
189
views
Find gas pressures of injection knowing mixture pressure without knowing volume
Let's say we have a gas 1 moving inside a pipe (we don't know the geometry) at mass flow rate $Q_1$ and temperature $T_1.$ We inject a gas 2 at some point inside the pipe with gas 1 at mass flow rate $...
- 65
1
vote
1
answer
215
views
Help with two containers problem, Xenon
In two containers we have Xenon. The volume of the first container is 2780 L, temperature is 300 degree Celsius, and n = 200 mol. Volume of the second container is 4000 L, temperature is 1300 degrees ...
- 311
1
vote
1
answer
242
views
Work done by system of ideal gas in isobaric expansion
Consider a system of ideal gas in a container with piston and the isobaric expansion of gas takes place.
As the process is isobaric, so initially the pressure of gas is equal to atmospheric pressure ...
- 444
0
votes
0
answers
114
views
Volume of compressed helium gas needed for FE test on ball valves
I'm currently doing a case study to find out the exact volume of helium gas required for FE tests on ball valves regards to the valves' volume and pressure class and the number of helium tanks needed ...
1
vote
1
answer
294
views
Textbook problem with molar mass of carbon dioxide
$\ce{K2CO3}$ and $\ce{HCl}$ react to produce $\ce{CO2}$. In an empty flask ( m = $\pu{85.431 g}$ ) we put in the produced gas and the mass of the flask is now $\pu{85.510 g}$. After that we fill the ...
- 311
1
vote
1
answer
1k
views
What gas law is involved when your ears "pop" when you are on a plane high in the air? [closed]
When you are up in the air, the air pressure decreases and the altitude increases. What gas law is involved in the situation wherein your ears "pop" because of the difference in pressure.
- 19
-1
votes
2
answers
707
views
Misconception of gas laws [closed]
I face a misconception with gas laws: Boyle’s law, Charles’ law, and Gay-Lussac’s law.
This is because each law of these assumes the constancy of one of the three following variables (the pressure, ...
- 11
2
votes
2
answers
551
views
Can Gay-Lussac's law be observed in the reverse direction?
Gay-Lussac's law states that if you decrease the temperature of a gas at constant volume, the pressure decreases by a corresponding amount. This is easy to carry out experimentally. But in practice is ...
3
votes
1
answer
450
views
Percent degree of dissociation of gas by pressure
I stumbled across the following interesting problem:
Assume that you have started to live on a new planet where standard pressure condition is $\pu{2 bar}$, standard concentration is $\pu{1 M},$ and ...
- 605
2
votes
1
answer
239
views
What actually happens to the volume of a gas in an isolated system?
In an isolated system with adiabatic walls in which gas is filled what exactly happens? How do we define the volume of a gas here? Is volume of 1 mole of gas present in that inelastic container the ...
-2
votes
2
answers
700
views
How do you manage to liquefy a gas by applying only pressure? [closed]
How can you liquefy a gas by applying only pressure? To increase the pressure of a gas you need a compressor, and when the compressor does work on the gas , it will increase his pressure but at the ...
- 21
0
votes
0
answers
102
views
Finding the partial pressure
So I saw this problem but can't seem to figure out how to get the answer. I got a test tomorrow lol.
41) $\ce{SO2Cl2}$ decomposes in the gas phase by the following reaction:
$$\ce{SO2Cl2 -> SO2(g)...
- 388
1
vote
0
answers
56
views
How to find the final pressure excerted by a mixture of gasses which are then released from a vessel after succesive fillings?
The problem is as follows:
$5\ \mathrm l$ of oxygen at $2\ \mathrm{atm}$ of pressure and $10\ \mathrm l$ of nitrogen at $4\ \mathrm{atm}$ are collected in a vessel of $2\ \mathrm l$ in capacity. ...
2
votes
1
answer
83
views
Why is so different the temperatures of a compressed gas compared to a liquid/gas mixture of the same fluid and they are both at the same pressure?
Why does $\ce{C3H6}$ gas when compressed (in a centrifugal compressor) comes out with a pressure of $\pu{16 bar}$ and $\pu{90 °C},$ and when it is a mixture of $\ce{C3H6}$ liquid/gas stored inside of ...
- 21
11
votes
5
answers
4k
views
Pressure vs volume plot for real gas and ideal gas
Background
Recently I have been studying about the states of matter and came to the topic of ideal gases and real gases, and the laws related to them. While studying it from my textbook, I saw the ...
user84548
0
votes
1
answer
50
views
Is the heat for constant pressure the same as for constant volume in the formation of nitric oxide?
In the reaction $\ce{N2 (g) + O2(g) -> 2NO (g)}$
my textbook[1] says $q_v$ and $q_p$ are not the same, without any explanation.
I know that
\begin{align}
\Delta U &= q_p + w\\
\Delta U &=...
- 119
6
votes
0
answers
74
views
Using Le Chatelier's Principle to Change Mechanical Energy to Chemical Energy
I was interested in an application of Le Chatelier's principle, where an increase in pressure could result in a decrease in the moles of gas.
In particular, a situation where when the pressure ...
- 169
2
votes
2
answers
1k
views
Calculating partial pressure of carbon monoxide
$\ce{ZnO}$ is exposed to pure $\ce{CO}$ at $\pu{1300 K}$ and the equilibrium
$$\ce{ZnO(s) + CO(g) <=> Zn(g) + CO2(g)}$$
is then established at $\pu{1 atm}$ pressure. The density of the gas ...
- 224
3
votes
1
answer
637
views
Isothermal vs adiabatic compression of an ideal gas [closed]
Could someone please explain these specific questions physically (especially the first question!)? I understand the corresponding mathematical proofs, but not the physical reasoning? I have looked ...
- 33
0
votes
2
answers
330
views
Coffee cup lids
So this morning I purchased a coffee. As a not uncommon event the lid on the coffee cup didn't have a hole completely punched through (a gas inflow hole). This makes it difficult to drink the coffee ...
- 29
1
vote
1
answer
543
views
How to calculate the aqueous solubility of CO2 vs Pressure
I would like to make Na2CO3 react with HCl in a closed fixed volume vessel, and accordingly I'd like to understand how ensuing pressure will affect the equilibrium of my reaction (and to which extent ...
- 1,107
3
votes
3
answers
429
views
Metering Device decreases pressure yet produces saturated liquid?
This question pertains to the change of state of liquid using a Metering Device as the refrigerant enters an Evaporator Coil of an HVAC system:
The Metering Device takes liquid and then reduces the ...
- 131
2
votes
1
answer
74
views
What value should I use for P in the ideal gas equation for an unknown molar quantity?
I did a chemistry lab, in which baking soda and vinegar were reacted in a ziplock bag, and I was to calculate the proper quantity of reactants to fill the bag with CO2. The molar quantity of gas was ...
- 133
1
vote
0
answers
32
views
Gas Law - increasing temperature with constant volume held
I've set up a simple experiment to look at the ideal gas laws. My experiment is relatively simple in that I have a metal tube which is capped on one side. I am then pressurising the tube with air to ...
- 11
0
votes
0
answers
39
views
Find the Total Pressure When the Faucet is Released
Two chambers are connected as shown in the figure. The total pressure of the first chamber that contains Ar and He gas is 98.4 atm. If the faucet is released, find the total pressure. (There's 1 mol ...
- 101
1
vote
0
answers
2k
views
Volume of dried gas at STP
A $54.0\ \mathrm{mL}$ sample of oxygen is collected over water at $20\ \mathrm{^\circ C}$ and $770\ \mathrm{Torr}$ pressure. What is the volume of the dry gas at STP?
By using the combined gas law, I ...
- 31
-3
votes
2
answers
322
views
What will be unit of volume in V=nRT/p if p is in Torr instead of atm? [closed]
$V=nRT/p$, where $n$ is amount of gas in $\mathrm{mol}$, $R$ is gas constant, $V$ is volume in $\pu{dm3}$, and $p$ is pressure in $\pu{atm}$.
What happens to $R$ if $p$ is in $\pu{Torr}$ instead of $...
- 1
0
votes
0
answers
29
views
Gas concentrations along the gradient from sea level to deep-sea
Studying scuba diving-related phenomenas I thought about how to estimate gases concentration down the sea.
Of course, solubility of gases at, for example, $5$ atm of pressure, can be estimated with ...
user43021
0
votes
3
answers
795
views
Pressure dependency in Haber Bosch ammonia synthesis
Haber-Bosch ammonia synthesis reaction:
$$\ce{3H2 +N2 -> 2NH3}$$
According to the ideal gas law: $pV=nRT$ where constant volume implies $\displaystyle \frac nV=\frac p{RT}$
Then $\displaystyle ...
- 11
-2
votes
1
answer
126
views
Pressure-Volume Formula Question
I have a chemistry homework problem that states the following:
$6.2$ L of $N_2$ at $0.74$ bar is mixed with a $15.2$ L sample of $O_2$ at $0.35$ bar. The gaseous mixture is placed in a container of ...
- 95
0
votes
1
answer
3k
views
Mass of oxygen in He+O2 mixture
A sample of $\pu{1.42 g}$ of helium and an unweighted quantity of oxygen gas are mixed in a flask at room temperature. The partial pressure of helium in the flask is $\pu{42.5 torr}$, and partial ...
- 409
1
vote
0
answers
35
views
Calculating Gas Pressure with Water Vapour
$\pu{4.0 L}$ of oxygen was collected by the displacement of water at $\pu{105.0 kPa}$ pressure and $\pu{30 ^\circ C}$. If the vapour pressure of water at $\pu{30 ^\circ C}$ is $\pu{4.2 kPa}$, ...
- 125
-2
votes
1
answer
259
views
Weight percentage of a component in gaseous mixture
Given a mixture of $\ce{He}$ and $\ce{O2}$ with density $\pu{0.47 g/L}$, temperature $\pu{298.15 K}$ and pressure $\pu{0.948 atm}$. What is the weight % of $\ce{He}$?
I get stuck in the formula
$$\...
- 7
5
votes
2
answers
1k
views
Calculate ozone layer thickness at a given temperature and pressure [closed]
The ozone concentration in the upper atmosphere averages $\pu{3.0 \times 10^13 molecules per cm3}$ in a region between $15$ and $\pu{35 km}$ high, at an average pressure of $\pu{0.001 atm}$ and ...
- 125
2
votes
2
answers
3k
views
When two containers at different T and P are kept together, will pressure become same or temperature?
Two containers, kept at different temperatures are connected through a stopcock and two different ideal gases at different pressures are filled inside them. Initially the stopcock is closed. When the ...
- 4,197
0
votes
0
answers
457
views
Why doesn't a temperature and pressure gradient exist in a container of real gas?
In the Kinetic theory of gases, it is assumed that there are no intermolecular forces between the atoms/molecules. But real gases, have intermolecular attractive and repulsive forces.
Suppose a ...
- 1,278
0
votes
0
answers
170
views
How does Le Chatelier's principle apply to a fuel tank full of hydrogen?
A nano-tube packed fuel tank is full of Hydrogen, and there is a steady pressure of Hydrogen in the tank. While hydrogen gas is being removed from the fuel tank to power the car, the pressure in the ...
- 495
15
votes
3
answers
10k
views
Why do helium balloons expand in volume as they go higher?
I realize as balloons go higher, the atmospheric pressure decreases, doing less to counteract the force of the gas particles pushing against the inner walls of the balloon. But at the same time, doesn'...
- 343
0
votes
4
answers
3k
views
Is vapour pressure of a liquid solution constant at a given temperature, no matter the size of closed container and amount of liquid taken?
Does vapour pressure of a liquid solution depend on the size of the closed container, the amount of solution taken, given that, the temperature is kept constant? Or will it change if some extra gas is ...
- 151
0
votes
2
answers
126
views
Understanding Avogrado's hypothesis
I have read that gases under identical conditions of temperature, pressure, and volume contain the same number of molecules, but every gas has different types of atoms so their force of attraction is ...