4 Stoichometry
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Vapor density =
Mass of certain volume of gases / Mass of same volume of hydrogen.
2 x Vapor density =
Molecular weight [RMM]
Define vapor density ->
Ratio of mass of certain volume of gas or vapor to the mass of same volume of hydrogen. Note: They should be measured under the same conditions of temperature and Pressure.
Empirical Formula ->
The formula of a compound which shows the simplest whole number ratio between the atoms of the elements in the compound.
What is percentage composition ->
It is percentage by weight of each element in the compound.
Percentage composition =
Wt. of the element in one molecule of the compound/ Gram molecule weight of the compound x 100
Avogrado’s number is
Number of atoms present in 12 gm of Carbon-12.
% Composition is also the
% by mass of atoms of an element present in one mole of the compound.
Relative number of atoms is ___ and it is also called ___
% Composition / Atomic weight Atomic Ratio
Molecular Formula ->
Chemical formula which represents the actual number of atoms of each element present in a molecule of a compound.
n=
Molecular weight / Empirical formula weight