Comments on: O Level Chemistry: Mole Concepts / Chemical Calculations http://www.simplechemconcepts.com/chemistry-question-mole-concepts-chemical-calculations-4/ O-Level Chemistry Made Easy Sat, 14 Jan 2012 03:43:17 +0000 hourly 1 http://wordpress.org/?v=3.0.4 By: sean http://www.simplechemconcepts.com/chemistry-question-mole-concepts-chemical-calculations-4/comment-page-1/#comment-437 sean Sun, 09 Mar 2008 15:39:44 +0000 http://simplechemconcepts.com/chemistry-question-mole-concepts-chemical-calculations-4/#comment-437 Well Presented Answer. That is Awesome! Keep up the good work. Well Presented Answer. That is Awesome!

Keep up the good work.

]]> By: Jennifer http://www.simplechemconcepts.com/chemistry-question-mole-concepts-chemical-calculations-4/comment-page-1/#comment-428 Jennifer Sat, 08 Mar 2008 15:58:19 +0000 http://simplechemconcepts.com/chemistry-question-mole-concepts-chemical-calculations-4/#comment-428 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 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

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