The empirical formula : H₃PO₄
The empirical formula (EF) is the smallest comparison of atoms of compound forming elements.
A molecular formula (MF) is a formula that shows the number of atomic elements that make up a compound.
(empirical formula) n = molecular formula
(EF)n=MF
Given
0.3086 g of hydrogen,
3.161 g of phosphorus
and 6.531 g of oxygen
Required
the empirical formula
Solution
mol H :
= 0.3086 g : 1,00784 g/mol
= 0.3062
mol phosphorus :
= 3.161 g : 30,973762
= 0.102
mol oxygen :
= 6.531 g : 15,999 g/mol
= 0.4082
Divide by 0.102 :
H : P : O = 3 : 1 : 4
The empirical formula : H₃PO₄
The molecular formula of the alcohol :C₃H₈O (propanol)
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molar mass
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