Percent Composition And Empirical Formula Worksheet With Answers Page 5
ADVERTISEMENT
1
2
3
4
5
6!
h)!
29.40% calcium,!
23.56% sulfur,!
47.04% oxygen
!
Assume 100.0 g sample
!
(29.40 g Ca)(1.0 mol Ca)!
=!
0.733 mol Ca!!
!
!
(40.1 g Ca)!
!
!
!
!
1:1:4 ratio
!
(23.56 g S)(1.0 mol S)!
=!
0.734 mol S! !
CaSO
4
!
!
(32.1 g S)! !
!
!
!
!
!
!
!
!
!
!
!
!
!
Calcium Sulphate
!
(47.04 g O)(1.0 mol O)!
=!
2.94 mol O! !
!
!
(16.0 g O)!
!
!
!
!
!
!
!
i)!
38.67% potassium,! 13.85% nitrogen,!
47.48% oxygen
!
Assume 100.0 g sample
!
(38.67 g K)(1.0 mol K)!
=!
0.989 mol K! !
!
!
(39.1 g K)!
!
!
!
!
1:1:3 ratio
!
(13.85 g N)(1.0 mol N)!
=!
0.989 mol N! !
KNO
3
!
!
(14.0 g N)!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
Potassium Nitrate
!
(47.48 g O)(1.0 mol O)!
=!
2.97 mol O! !
!
!
(16.0 g O)!
!
!
!
!
!
!
!
j)!
60.0% magnesium,! 40.0% oxygen
!
Assume 100.0 g sample
!
(60.0 g Mg)(1.0 mol Mg)!
=!
2.47 mol Mg! !
1:1 ratio
!
!
(24.3 g Mg)
!
(40.0 g O)(1.0 mol O)!
=!
2.50 mol O! !
MgO
!
!
(16.0 g O)!!
!
!
!
!
!
!
!
!
!
!
!
!
!
Magnesium oxide
ADVERTISEMENT
0 votes
Related Articles
Related forms
Related Categories
Parent category: Education