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Example:
The following results were obtained in an experiment to determine the formula of an oxide of silicon.
Mass of crucible (empty) = 15.20g
Mass of crucible + silicon = 15.48g
Mass of crucible + oxide of silicon = 15.80g
a) Find the empirical formula of the oxide of silicon
b) If the Mr of the oxide of silicon is 60, what is its molecular formula?
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What is the empirical formula of oxide of silico
Well Presented Answer. That is Awesome!
Keep up the good work.
Mass of silicon
= 15.48-15.20
=0.28g
Mass of silicon oxide
=15.80-15.20
=0.60g
Mass of oxygen
=0.60-0.28
=0.32g
Element Si O
Mass of Element 0.28g 0.32g
Ar of Element 28 16
No. of moles 0.01mol 0.02mol
Molar ratio 1 : 2
a) Hence, empirical formula of silicon oxide: SiO2
n= 60/ (28+32)
n=1
b) thus, molecular formula = SiO2