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baherus [9]
3 years ago
13

The mole fraction of oxygen in dry air near sea level is 0.20948. The concentration of

Physics
2 answers:
hram777 [196]3 years ago
6 0
N sub air = ( P ) ( V ) / ( R ) ( T ) 

<span>n sub air = ( 739 / 760 ) ( 1.000 ) / ( 0.08205 ) ( 28.5 + 273.2 ) </span>

<span>n sub air = 0.03928 mol per L </span>

<span>R = universal gas constant = 0.08205 atm - L per mol - deg K </span>

<span>Find moles O2 per liter : </span>
<span>--------------------------------------... </span>

<span>n sub O2 = ( y sub O2 ) ( n sub air ) </span>

<span>n sub O2 = ( 0.20948 ) ( 0.03928 ) </span>

<span>n sub O2 = 0.008228 moles O2 per L </span>

<span>Now apply Avogadro's Number to get the O2 molecules per liter : </span>
<span>--------------------------------------... </span>

<span>N sub O2 = ( n sub O2 ) ( N sub AVO ) </span>

<span>N sub O2 = ( 0.008228 ) ( 6.022 x 10^23 ) </span>

<span>N sub O2 = 4.96 x 10^21 O2 molecules per liter

It's C.

</span>
BlackZzzverrR [31]3 years ago
3 0
C,d,or e you can use the process of elimination to decide...
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3 years ago
Air temperature in a desert can reach 58.0°C (about 136°F). What is the speed of sound (in m/s) in air at that temperature?
Veronika [31]

The approximate speed of sound in dry (0% humidity) air, in meters per second, at temperatures near 0 °C, can be calculated from

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3 0
3 years ago
An astronaut sitting on the launch pad on Earth's surface is 6,400 kilometers from Earth's center and weighs 400 newtons. Calcul
PIT_PIT [208]

Answer:

weight at height = 100 N .

Explanation:

The problem relates to variation of weight  due to change in height .

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At the surface :

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400 = G Mm / R²

400 = G Mm / (6400 x 10³ )²

G Mm = 400 x (6400 x 10³ )²

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= 400 / 4

= 100 N .

weight at height = 100 N

5 0
3 years ago
The Atoms Family
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What question are you asking?
4 0
2 years ago
What are the equivalent celsius and kelvin temperatures of -128 f?
Gre4nikov [31]

Answer:

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Explanation:

hope this helps have a good day

6 0
2 years ago
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