What is the empirical formula of a compound that contains 75.7% arsenic and 24.3% oxygen?
Empirical formula is the simplest formula for a compound.
Arsenic's symbol is
Firstly, we need to make an assumption that the mass of the compound is 100g so that it is easier for us to convert the percentage of each of the element into its respective mass .
Based on the assumption;
Then, we convert each of the element mass into the number of moles by dividing it with its respective molar mass;
To calculate the number of moles of arsenic;
To calculate the number of moles of oxygen;
To find the relation between arsenic and oxygen, we divide each elements' number of moles with the smallest number of moles available .
Convert both values into whole number, which is by multiplying with
Put the values all together with respective element's symbol and we get the empirical formula of