Lecture 29: % Composition & Empirical formulas Flashcards
1
Q
why does combustion analysis need to be done with excess oxygen
A
so it is a complete reaction
2
Q
can the quantity of CO2 obtained in a combustion analysis be a direct measure of the oxygen content of the starting material
A
no because the excess flow of oxygen makes it messy
3
Q
can results of a combustion analysis ever give molecular formula
A
yes, if empirical formula is equal to molecular formula
4
Q
molecular formula is…
A
MOLAR mass / empirical mass
5
Q
what is mole ratio
A
=CxHyOz
6
Q
what is empirical formula
A
the one you get from finding moles through stoic
7
Q
what is molecular formula
A
the one you find through a given mass / empirical mass
