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Gas Law
Pressure: force exerted in an object per surface area
Foricelli's barometer: measure's atmosphere pressure
Atmosphere pressure: amount of force exerted by the air above us

Main units to use: PA(pascal) or KPA(kilo pascal)
Often units used: torr(mm HG), ATM
Convertion:
1 atm = 101
...
325

x

:5

solution: 1x5 and 101
...
325x = 5
x = 5/101
...
049346163
x = 0
...
325 Kpa
SATP = standard ambient temperature and pressure
Temperature: 25 degrees Celsius
Pressure: 100 Kpa
Tips: - measurements should always be or converted to Kpa
...

--------------------1
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3 ml of O2 gas in a burette
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2 ml of gas in the burette and the pressure was 109 kpa
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3 ml
V2 = 40
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3) = 103 (40
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11kpa
example 2: a 45
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6 mml
P1 = 490 torr
P2 = 3 atm
*since torr and atm was given, convert one of them to torr or atm, units of
measurements should all be the same
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644736842
x = 0
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645) (45
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804 ml

----------------------------2
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(Reaction: temperature increases: molecules move
faster and occupy more space)
Problem with the theory: low pressure and at high pressure gases
condense

Formula : V1/T1 = V2/T2
-temperature should be in kelvins and volume in litres
...

*Absolute zero: 0K or -273 degrees celsius is the lowest possible
temperature - molecules do not move
C --> K = +273, K --> C = -273
example 1: a sample of nitrogen gas surrouding a circuit board occupies
a volume of 300 ml at 17 degrees celsius
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86 ml
example 2: a 14
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3 dCelsius is drawn into a

syringe with a max volume of 60 cm3
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3 cm3
V2: 60 cm3
T1: 24
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3 K
Solution: V1/T1 = V2/T2
14
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3 = 60/T2
T2 = 1230K - 273 = 957 degrees Celsius
--------------------------3
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(Reaction = as the temperature increases,
the molecules move faster therefore exerts more force on its surroundings)

Formula: P1/T1 = P2/T2
example 1: an unknown gas is collected in a 250 ml flask and sealed
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5
kpa at 15 degrees celsius
...

Given: P1 = 135
...
5 kpa/ 288 = P2/ 576
P2 = 271 kPa
example 2: at 18 degrees celcius, a sample of helium gas stored in a
metal cylinder eerts pressure of 17
...
What will the pressure become if
the tank is place in a closed room where the temperature increases to 40
degrees celcius
Given: P1 = 17
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5 / 291 = P2 / 313
P2 = 18
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18
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5 / 17
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074 x 100%
= 7

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