1.5 - Chemical formulae, equations and calculations Flashcards
1
Q
What is Avogadro’s number?
A
Equal volume of gases at the same tempreture and pressure contain equal number of molecules.
2
Q
What is volume of gas measured in?
A
cubic decimetres (dm3)
divide by 1000 between cm and dm3
3
Q
What is the calculation for molar volume?
A
Volume = number of moles x molar volume
4
Q
How to calculate the percentage of an element in a compound?
A
% mass of an element = Ar x number of atoms in the element / Mr of the compound x 1000
5
Q
What is the calculation for reacting mass?
A
Moles = Mass / Mr
6
Q
What is percentage yield calculation?
A
Percentage yield = actual yield / theoretical yield x 100
