Quantitative Chemistry Flashcards
1
Q
number of moles=
A
mass (g) / mr
2
Q
how many atoms are in a mole?
A
6.02 x 10^23
3
Q
mass of an atom
A
mass of one mole / avogadros constant
4
Q
what is uncertainty?
A
the doubt with measurement when using a piece of apparatus to measure
5
Q
uncertainty symbol
A
6
Q
uncertainty equation
A
range /2
7
Q
percentage yield calculation
A
mass of actual product / maximum theoretical mass of product x1000
8
Q
why don’t we always reach 100% percentage yield?
A
some reactions are reversible
some of product may be lost when it is separated from the reaction mixture
some of the reactants may react in different ways
some of the reactants may be impure
