CH2 Amount of Substance Flashcards
Symbol for amount of substance
n
Unit used to measure amount of substance
mole
What does Avogadro constant represent
Number of atoms per mole of carbon-12 isotope
How to calculate mass of 1 mole of an element
mass of 1 mole = relative atomic mass in grams
How to calculate moles when mass and molar mass given
moles = mass/molar mass
Avogadro’s Law
Under the same temperature and pressure, 1 mole of any gas would occupy the same volume
How much volume does 1 mole of gas occupy at RT and pressure
24 dm3 or 24000 cm3
Define molar gas volume
The volume per mole of gas molecules
Why do different gas particles occupy the same volume
Gas particles are very spread out, hence individual differences have no effect
How to calculate moles when gas volume is given
moles = volume(dm3)/24 moles = volume(cm3)/24000
5 ideal ways in which gases behave
In continuous motion
No intermolecular forces experienced
Exert pressure when they collide with each other or container
No kinetic energy lost in collisions
When temperature increases, so does kinetic energy of gases
Ideal gas equation
pV = nRT
Pressure(Pa) x Volume(m3) = moles (mol) x Gas constant (8.314J mol-1) x Temperature (K)
1 atmospheric pressure = how many pascals
1 atm - 101325 Pa
0 degrees C = how many Kelvin
273 K
Waht does concentration of a solution mean
Amount of solute dissolved in 1 dm3 of solvent
