EINDING THE EMPRICALFORMULA CE A COMPOUND The empirical formula of a compound sh

Question

EINDING THE EMPRICALFORMULA CE A COMPOUND The empirical formula of a compound shows the ro of re aoms in it. H s can find 1.-e con constrt inso mmbers of partides and ,nd cives us the ratio of atoms, wtiks the molecular omla teles us the actual number of Empirical fonmula Rules for Finding an Empirical Formula a Write te aymbols for the elemares present. b) Fr,d the mass (or %) n! each element pregnt i, te oome tuna e) Find the relaive mass of each element hom the Periodic Table d) Divide the mass of each element by ts relative atomc Dide ch numbar in the raio by tre smailest number so ge1 a whol mass to gue rato or atoms. Example 20g of a campound of Sicon with tydrogan contsina 17.5g cl silcon Find the empiecal 20-175 2.5 Mass of elemat Relavivn Mass 2.5+1 25 2.5+0.625- 28 0,625 through by whole Nu ber Hato Empirica Formula

Explanation / Answer

Molecular formula    Emperical formula

H2O2                                HO

C2H4                                CH2

C2H6                                CH3

C6H12                              CH2

K2O2                                KO

C6H12O6                         CH2O

2.

Element     Mass   Number of moles     Division by small number    Simple whole number

Si                17.5 17.5 / 28 = 0.625      0.625 / 0.625 = 1                      1

H                  2.5        2.5 / 1 = 2.5             2.5 / 0.625 = 4                           4

Therefore, emperical formula = SiH4

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