booklet 3-quantative chemistry Flashcards
what does Ar stand for
the relative atomic mass
what is the Ar
the average mass of all isotopes of an element
what is the relative atomic mass the same as
the Ar is effectively the same as the mass number
what is the relative atomic mass of oxygen
16
what is the Mr
the relative formula mass
what does the relative formula mass deal with
éléments and compounds
how can the relative formula mass be worked out
adding all the relative atomic masses of all elements involved in a compound together
what must be balanced
equations
what is conservation of mass
the total mass of reactants must equal the total mass of the products
how can you find out if an equation is balanced
add up on boths sides the relative atomic mass and the relative formula mass
what can you use conservation of mass to predict
we can predict the amount of product in a reaction and the mass of reactants
why is it not always possible to obtain the calculated mass of product
1-the reaction may not go to completion because it is reversible
2-some of the product may be lost
3-side reactions may occur
equation involving moles and concentration
moles equals concentration times volume
equation involving mass and concentration
mass equals concentration times volume
