What is Partial pressure: Definition and 85 Discussions
In a mixture of gases, each constituent gas has a partial pressure which is the notional pressure of that constituent gas if it alone occupied the entire volume of the original mixture at the same temperature. The total pressure of an ideal gas mixture is the sum of the partial pressures of the gases in the mixture (Dalton's Law).
The partial pressure of a gas is a measure of thermodynamic activity of the gas's molecules. Gases dissolve, diffuse, and react according to their partial pressures, and not according to their concentrations in gas mixtures or liquids. This general property of gases is also true in chemical reactions of gases in biology. For example, the necessary amount of oxygen for human respiration, and the amount that is toxic, is set by the partial pressure of oxygen alone. This is true across a very wide range of different concentrations of oxygen present in various inhaled breathing gases or dissolved in blood. The partial pressures of oxygen and carbon dioxide are important parameters in tests of arterial blood gases, but can also be measured in, for example, cerebrospinal fluid.
Homework Statement
From Milton Ohrings "Materials science of thin films", problem 3.5.
An Al film was deposited at a rate of ~1\mum/min in vacuum at 25°C,
and it was estimated that the oxygen content of the film was 10^{-3}. What
was the partial pressure of oxygen in the system...
Homework Statement
At 600 K the equilibrium constant is 38.6 for the reaction
2 HI(g) <--> H2(g) + I2(g)
Start with a pressure of 0.725 atm consisting of only HI(g) at 600 K. Calculate the equilibrium
partial pressures of HI, H2 and I2.
Homework Equations
K=[C]^n[D]^n/[A]^n
Qp =...
I've got a closed system that consists of a glass container (non gas permeable) filled with pure CO2 at atmospheric pressure, with an airlock that will let CO2 escape if the pressure inside the system becomes higher (barometric pressure changes, etc.), but will not let air back into the system...
Homework Statement
A cylinder contains 1 L of air at 10 atm and 298 K.
Knowing that air is composed of 79% N2 and 21% O2 by VOLUME, calculate the initial partial pressure for both.
Homework Equations
Ideal Gas Law: PV = nRT
Mole Fraction: yi = moles of i / total moles
Partial Pressure: Pi...
Hi everyone
I'm reading up on the possibility of liquid water existing on the surface of Mars, and have confused myself!
During my reading, I have come across various definitions that say liquid water can exist if the temperature is above 273 K and the atmospheric pressure is above 611 Pa...
So I've been working on this for awhile now and I am just not getting to the right answer.
The exact question is:
When 1.7 mol of NOCl was heated to 225 C in a 353 L steel reaction vessel the NOCl partially decomposed according to the following equation:
2NOCl ---->2NO + Cl2
What are the...
Homework Statement
I have the reaction:
A(g) + 2B2(g) -> AB4(g)
The equilibrium constant K(T=298) = 10, and all gases are ideal.
So the two reagents A and B are mixed together at 1 bar and T = 298K, with the quantities 1 mol of A and 1 mol of B.
Now I have to find the partial pressure of...
I have a little question regarding partial pressure. Partial pressure I understand fully, when we talk of an ideal gas mix. The partial pressure is product of the fractional concentration and the total barometric pressure. And in thinking in molecular terms that is like saying the amount of...
How to count molecules and determine density, partial pressure and total pressure?
Homework Statement
Consider three identical boxes each containing a different mixture of O2 and N2. In box #1 are 3 molecules of O2 and 7 molecules of N2. In box #2 are 1 molecule of O2 and 2 molecules of...
Hello everyone,
The partial pressure of the atmosphere 33 feat benath the surface is doubled the normal amount. (2x760 mmHg). I can understand how lower you go down higher the pressure but I don't understand how you can measure atmospheric pressure under the sea. I mean under the sea you got...
Hello everyone,
Ok to understand the respiratory system, proper understanding of this diagram is essential. Something I don't have, so if anyone can help me with these questions I would be very greatful. Thanks :smile:
http://img515.imageshack.us/img515/8923/rightbv.jpg
1. Anatomic dead...
Homework Statement
We discussed the fact that the formation of some trace gases is thermodynamically unfavorable at low temperature, but more favorable at elevated temperatures. Using the values for delta G and delta H in the notes, calculate the equilibrium partial pressure of NO2 during...
How is oxygen partial pressure measured? Can a mass flow controller (MFC) be used to control it? If so, what is the relationship between flow [sccm] and pressure [Pa]?
Thanks!
The gas phase decomposition of ethylamine produces ethane and ammonia according to the following equation:-
C2H5NH2 (g) → C2H4 (g) + NH3 (g)
The following total pressures were found for this reaction at 500°C with an initial pressure of pure ethylamine equal to 55 mm Hg...
if you have an equation such as H2+2O2=2HNO2 and you know the partial pressure of H2 is .5 and the partial pressure of O2 is .3, does that mean that the partial pressure of 2HNO2 is .8?
Homework Statement
if you have an equation such as H2+2O2=2HNO2 and you know the partial pressure of H2 is .5 and the partial pressure of O2 is .3, does that mean that the partial pressure of 2HNO2 is .8?
Homework Equations
The Attempt at a Solution
Homework Statement
if you have an equation such as H2+2O2=2HNO2 and you know the partial pressure of H2 is .5 and the partial pressure of O2 is .3, does that mean that the partial pressure of 2HNO2 is .8?
Homework Equations
The Attempt at a Solution
Homework Statement
The air in a bicycle tire is bubbled through water and collected at 25 ^\circ {\rm C}. If the total volume of gas collected is 5.25 L at a temperature of 25 ^\circ {\rm C} and a pressure of 734 torr, how many moles of gas was in the bicycle tire?
Homework Equations
PV...
1. Assume that two cylinders at 27° C are connected by a closed stopcock(valve) system. The right-hand cylinder contains 2.4L of hydrogen at 0.600 atm; the left cylinder is larger and contains 6.8 L of helium at 1.40 atm.
a) How many moles of each gas are present?
b) What is the total pressure...
1) Question:
A sample of oxygen is collected in a 172 mL
container over water at 15C, and the barom-
eter reads 754 torr. What volume would the
dry gas occupy at 778 torr and 15C? Water's
partial pressure at 15C is 12:8 torr. Answer
in units of mL.
2)attempt to answer:
pv=PV
temp...
Homework Statement
This is not a textbook question.
Henry's Law states that:
p=kx
where p=pressure of gas
x=mole fraction of gas in solution
k= Henry's constant
and k=p/x
So, we can say that k tells us the pressure of gas per unit x.
Which means k tells us the pressure of the gas...
Homework Statement
The combined pressure of 32.0 g of CH4, 64.2 g NH3, and 100 g of CO2 is 9.42 atm. What is the partial pressure of the NH3
Homework Equations
Dalton's Law of Partial Pressure = P=Pa +Pb + Pc ...
The individual partial pressure follow the ideal gas law. For...
Homework Statement
An atmospheric chemist fills a gas-reaction container with gaseous dinitrogen pentaoxide to a pressure of 130. kPa, and the gas decomposes to nitrogen dioxide and oxygen. What is the partial pressure of nitrogen dioxide, PNO2, (in kPa) when the total pressure is 166 kPa...
so there's a mixture of CO2, SO2, and H2O gases in a 21L tank. Pressure inside is 850Torr at 45*C. if SO2 concentration in mixture is 7.95x10^3 ppmv (where ppmv=[V component/V total mixture]x10^6), find its partial pressure.
so i found the volume of SO2 to be 0.16695L using the ppmv (where V...
Temperature is constant.
At first, this system is closed.
In tank one:
A 2 Liter tank containing H2 at a pressure of 1.5 atmospheres.
In tank two:
A 1 Liter tank containing N2 at a pressure of 3 atmospheres.
In tank three:
A 4 Liter tank containing CO2 at a pressure of 1...
Pure solid ammonium carbamate, NH4CO2NH2, is allowed to dissociate into a vacuum according to the equation:
NH4CO2NH2(s) ---> 2 NH3(g) + CO2(g)
At 25oC, the total pressure of the gases in equilibrium with the solid is 0.116 atm. If carbon dioxide, CO2, was then added, sufficient to have...
I am a systems engineer responsible for some RF hardware. This system has a dehydrator installed that provides dry air to the feed of a satellite tracking antenna. The dehydrator is connected to the feed via about 30 feet of plastic hose about 1/4 inch ID. The feed is about 3 or four cubic...
Question 1: 5L of nitrogen at 100kPa and 298K and 5L of oxygen at 200kPa are pumped into a evacuated 50L cylinder. Temperature remains constant, what is the total pressure in the cylinder?
Correct Answer: 30kPa
My answer: 300 kPa
Question 2: A 10L flask containing nitrogen at 500mmHg is...
Question 1: 5L of nitrogen at 100kPa and 298K and 5L of oxygen at 200kPa are pumped into a evacuated 50L cylinder. Temperature remains constant, what is the total pressure in the cylinder?
Correct Answer: 30kPa
My answer: 300 kPa
Question 2: A 10L flask containing nitrogen at 500mmHg is...
I have this question about partial pressure, and I'm not entirely sure what it is, and how to solve for it...
Q. Solid glucose, C6H12O6 (s) is burned in excess oxygen in a closed container. After the reactiopn, the total gas volume is 10.0L at a temperature of 298K. Wha is the PARTIAL...
I am having the hardest time figuring this one out:
"Calculate the partial pressure of propane in a mixture that contains equal numbers of moles of propane (C3H8) and butane (C4H10) at 20 °C and 1918 mmHg. Give your answer in mmHg"
Can anybody help me out? I'm so lost!