Chemical formulae, equations, and calculations .

Cards (9)

What does the law of conservation of mass state?
Atoms cannot be created or destroyed. The total mass of the reactants is equal to the total mass of the products.
How do you calculate the percentage mass of an element? 
% mass of element = Ar x number of atoms of the element
---------------------------------- x 100
Mr of compound
What is avogadros constant?
6.02 x 10^23
What is a mole?
The unit for the amount of substance.
What is yield?
The amount f product that is produced in a chemical reaction.
How do you calculate the percentage yield?
percentage yield= actual yield
--------------------- x 100
Theoretical yield
What is empirical formula?
It is the simplest whole - number ratio of the atoms present in a compound.
What is molecular formula?
It shows the actual number of atoms of each element present in a molecule or formula unit.
How do you calculate molecular formula?
molecular formula = relative formula mass
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empirical formula