Unit B: Gas laws Outcome 2 Flashcards
Gay Lussacs law
At a constant volume, the pressure of a gas increases with an increase in
temperature
Whats an example of Gay Lussac law
A can of hairspray
Whats a key thing to remember at these ratios
that they’re aren’t addition, they’re coefficients of the compounds
Avogardos theory
Vr= Vg x coefficientrecquired /
coefficientgiven
molar volume
Molar volume is the volume that one
mole (6.02x 1023 molecules) of a gas
occupies at a specific temperature
and pressure.
STP Molar volume
22.4
SATP molar volume
24.8
Molar volume formula
n=v/vm
Ideal gas law
A single, ideal-gas equation can be used to describe the relationship between pressure,
temperature, volume, and chemical amount of matter:
What is an ideal gas?
An ideal gas is a theoretical gas that perfectly follows the Ideal Gas Law and has no intermolecular forces
How do real gases differ from ideal gases?
Real gases do not always follow the Ideal Gas Law due to intermolecular forces and finite molecular volume.
Who formulated the Law of Combining Volumes?
Joseph Louis Gay-Lussac
What units of temperature must be used in the Ideal Gas Law?
Kelvin
In the Ideal Gas Law, what does P represent
pressure
: Define STP in terms of temperature and pressure.
Standard Temperature and Pressure (0°C or 273.15 K and 1 atm)
Q14: In the context of the Law of Combining Volumes, how do you express gas volumes?
A14: Volumes of gases are expressed in liters or other volume units, assuming equal conditions of temperature and pressure.
Q12: If 1 L of gas A reacts with 2 L of gas B to produce 3 L of gas C, what ratio does this demonstrate?
1:2:3
Q: How would you rearrange the ideal gas law to solve for n (number of moles)?
A: n = PV / RT.
Q: If 1 mole of an ideal gas is at 2 atm pressure, what will be its volume at STP?
less than 22.4
Q: How does the molar volume of a gas change with temperature and pressure?
A: As temperature increases (at constant pressure), the molar volume increases, and as pressure increases (at constant temperature), the molar volume decreases.
Q: Give an example of a reaction that demonstrates the law of combining volumes.
A: The reaction of hydrogen gas with oxygen gas to form water vapor: 2 H₂(g) + O₂(g) → 2 H₂O(g) (2 volumes of H₂ and 1 volume of O₂ combine to form 2 volumes of H₂O).
Ideal Gases
-Always a gas
Real Gases
-Pressure is low
-Temperature is high
-Like at STP or SATP
Avogardos number
6.02x10^23
