5.1 to 5.10 Flashcards
what is a mole ?
is the amount of any substance containing as many particles as there are carbon atoms in exactly 12g of carbon-12
what is the Avogadro’s constant ?
the number of atoms per mole of the carbon - 12 is isotope - mol -1
how much is contained in 1 mole ?
6.02 x 10 (23) atoms / molecules
what is the equation to working out the number of particles ?
Avogadro’s number x number of moles
Equation for number of moles
mass / Mr
Equation for the percentage of mass of element
total mass of the element in the compound / relative formula mass of compound
molecular formula
the number and type of each atom in a molecule
empirical formula
the simplest whole-number ratio of atoms or ions of each element in a compound
what did Amedeo Avogadro propose in 1776-1856 ?
the law that equal volumes of gases at the same temperature and pressure contains equal numbers of molecules
what are the three things that the volume of a sample of a gas depend on ?
temperature
pressure
amount of gas in moles
what is the ideal gas equation ?
- the behaviour of an ideal gas can be summed up by combining the gas laws into single equation
pV = nRT
Kelvin
K = *C + 273
Celsius
*C = K - 273
If your pressure is in Pa, what is your answer
m3
If your pressure is in KPa, your answer is in
dm3
what is the molar volume ?
the volume of 1 mole of a gas under stated ocnditions
at room temperature and pressure, what is the molar volume of all gases ?
24 dm3 mol-1
For a gas at RTP you use:
no. moles = volume/ 24
no. moles = volume/24,000
what is concentration ?
how much solute is dissolved in a certain volume of a solution
concentration equation
no. moles/ volume
how do you convert from cm3 to dm3 ?
divide 1000
how do you convert from dm3 to cm3 ?
multiply 1000
