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Assuming that air contains 78 percent $\mathrm{N}_{2}, 21$ percent $\mathrm{O}_{2},$ and 1 percent $\mathrm{Ar},$ all by volume, how many molecules of each type of gas are present in $1.0 \mathrm{L}$ of air at STP?

$2.1 \cdot 10^{22}$ molecules $\mathrm{N}_{2}$$5.6 \cdot 10^{21}$ molecules $\mathrm{O}_{2}$$2.7 \cdot 10^{20}$ molecules Ar

Chemistry 101

Chapter 5

Gases

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Lectures

05:03

In physics, a gas is one of the three major states of matter (the others being liquid and solid). A gas is a fluid that does not support tensile stress, meaning that it is compressible. The word gas is a neologism first used by the early 17th-century Flemish chemist J.B. van Helmont, based on the Greek word ("chaos"), the simplest of all the elemental forms of matter.

04:46

In physics, thermodynamics is the science of energy and its transformations. The three laws of thermodynamics state that energy can be exchanged between physical systems as heat and work; that the total energy of a system can be calculated by adding up all forms of energy in the system; that energy spontaneously flows from being localized to becoming dispersed, spread out, or uniform; and that the entropy of an isolated system not in equilibrium will tend to increase over time, approaching a maximum value at equilibrium.

04:47

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Okay, this question 49 chapter live in And we have one low at ste people. This gas that has three give fantastic gases. We have nitrogen, Occident, and we have a 1% Oregon. So it's right to know how many molecules particles we have at one leader as t. P. So the first thing that happened to you issues saw for the moves they give us. We have one home, and we're gonna divide that by, um, no. Have one leader about going out One leader. So you have one leader and that s t P leaders is 22.4 leader. So this comes out formal city 0.0 four or five. Most okay. Okay. Does. So that's what we're gonna multiply for each, um, element that we have. So we have a 78% and want to put this in a decimal form. So it was going to point seven eight. You wanna multiply that by the moles? A point what? To buy by 0.0 for five. And this is going to come out to be 0.0 35 one. But we're not done yet because the moves, but we have to find, um, the number of particles. So you do that by multiplying this by, ah, for God Rose number, which is six 0.0, to to times 10 to 23rd. And when you saw for this number of particles for Majin should be too 0.1 times 10 to the 22 for nitrogen. I didn't. Let's move on, Teoh. Oxygen and Oxygen is that has 21%. So it's gonna change the point 21 That's the point 045 moles and this is gonna be equal two point zio zero nine five moles and now into the sulfur particles thing. You do that by multiplying buy avocados number, and this is going to come out to be five 0.7 times 10 to the 21 oxygen, Okay. And the last thing we have is are gone and we have 1% of are gone, so that may change. The point is you have one times a point zero 45 moles that have come out to be 0.0 zero zero for five or 4.5. Time to tend to negative for most of papa avocados. Number Teoh about a number of particles and this comes out to be too 0.7 times 10. The 20 for are gone. Okay, So these a number of particles for each element.

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