Topic 5 Flashcards
Ideal gas equation
pV = nRT
Units of p (pressure) in ideal gas equation
Pa
Units of v (volume) in ideal gas equation
m^3
Units of T (temp) in ideal gas equation
K
Units of n (amount of substance) in ideal gas equation
Mol
How to convert from dm3 to m3
Divide by 1000
How to convert from cm3 to m3
Divide by 1000000 (one million)
How to convert from degrees Celsius to kelvin (k)
Add 273
How to convert from k (kelvin) to degrees Celsius
Minus 273
Ideal constant value (R)
8.314 J k-1mol-1
Assumptions made for ideal gas equation
- gas molecules are tiny compared to the spaces between the
- there are no forces acting between the gas molecules
- gas molecules are moving randomly
- when gas molecules collide there collisions are elastic
What is atmospheric pressure (room pressure)
101000 pa
Or
101KPa
How to find the molar volume of a gas experiment (finding the volume of carbon dioxide)
1) place a measuring cylinder filled with water into a bowl of water upside down then hold it slightly above the bottom of the bowl with a clamp stand and place a delivery tube underneath the measuring cylinder attached to a boiling tub
2)Place 30 cm3 of ethanoic acid in the boiling tube
3)Place 0.05 g of calcium carbonate in a test tube
4)Weigh the test tube and its contents accurately.
5) Remove the bung from the boiling tube and tip the calcium carbonate into the boiling tube.
Quickly replace the bung in the boiling tube.
6) Once the reaction is over, measure the volume of gas collected in the measuring cylinder.
7) Reweigh the test tube that had contained the calcium carbonate.
8) Repeat the experiment six more times, increasing the mass of calcium carbonate by about
0.05 g each time until you reach 0.40g
What is room temperature
20 degrees Celsius
How to calculate the moles OF A GAS at room temperature and pressure
Volume (dm3) / 24dm3
