Respuesta :
PCL₅ is the empirical formula of the compound.
Phosphorous pentachloride is it's if empirical formula and molecular formula are assumed to be the same.
Empirical formula is the lowest relative ratios of atoms that are present in a molecule or compound. It shows the simplest ratio and not the actual number of atoms hence should not be confused with molecular formula.
quantity of phosphorus : 4.14g
quantity of white compound after combining with chlorine : 27.8g
therefore quantity of chlorine = 27.8g - 4.14g => 23.66g
Molecular weight of Phosphorus: 30.97g
Molecular weight of Chlorine: 35.45g
For no. of moles= given weight / molecular weight
Moles of phosphorus= 4.14g / 30.97 => 0.1337 moles
Moles of Chlorine= 23.66g / 35.45 => 0.6674 moles
For empirical formula, we divide with the smaller entity i.e. 0.1337
Phosphorus: 0.1337 / 0.1337 => 1
Chlorine: 0.6647 / 0.1337 => 5
hence the empirical formula is PCL₅
Name of the compound : Phosphorus pentachloride
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