Percent Composition And Empirical Formula Worksheet With Answers Page 6
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1
2
3
4
5
6!
k)!
52.0% zinc,! !
9.6% carbon,! !
38.4% oxygen
!
Assume 100.0 g sample
!
(52.0 g Zn)(1.0 mol Zn)!
=!
0.795 mol Zn!!
!
!
(65.4 g Zn)!
!
!
!
!
1:1:3 ratio
!
(9.6 g C)(1.0 mol C)! !
=!
0.80 mol C! !
ZnCO
3
!
!
(12.0 g C)! !
!
!
!
!
!
!
!
!
!
!
!
!
!
Zinc Carbonate
!
(38.4 g O)(1.0 mol O)!
=!
2.4 mol O!
!
!
!
(16.0 g O)!
!
!
!
!
!
!
!
l)!
60.98% arsenic, !
39.02% sulfur
!
Assume 100.0 g sample
!
(60.98 g As)(1.0 mol As)!
=!
0.814 mol As!!
!
!
(74.9 g As)!
!
!
!
!
2:3 ratio
!
(39.02 g S)(1.0 mol S)!
=!
1.216 mol S! !
As
S
2
3
!
!
(32.1 g S)! !
!
!
!
!
!
!
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!
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!
!
Arsenic Sulphide
!
m)!
34.6% gallium, !
17.8% carbon, !
47.6% oxygen
!
Assume 100.0 g sample
!
(34.6 g Ga)(1.0 mol Ga)!
=!
0.496 mol Ga!!
!
!
(69.7 g Ga)!
!
!
!
!
!
1:3:6 ratio
!
(17.8 g C)(1.0 mol C)!
=!
1.483 mol C! !
EF!
=!
GaC
O
3
6
!
!
(12.0 g C)! !
!
!
!
!
!
!
Ga
C
O
2
6
12
!
!
!
!
!
!
!
!
Actual cmpd!!
Ga
(C
O
)
2
2
4
3
!
!
(47.6 g O)(1.0 mol O)!
=!
2.975 mol O! !
!
Gallium oxalate
!
!
(16.0 g O)!
!
!
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!
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