Chapter 7

- Chapter 7 -36. Empirical formula5.276 g compound 3.898 g Hg ¼ 1.378 g Cl 1 mol Hgð3:898 g HgÞ¼ 0:01943 mol Hg200:6gHg 1 mol Clð1:378 g ClÞ¼ 0:03887 mol Cl35:45 g Cl0:01943 mol Hg0:019430:03887 mol Cl0:01943¼ 1:000 mol Hg¼ 2:001 mol ClThe empirical formula is HgCl 2 .37. Empirical and molecular formulas of benzoyl peroxide.69.42% C, 4.16% H, 26.42% O; molar mass ¼ 242 g 1 mol C5:780 mol Cð69:42 g CÞ¼ 5:780 mol C¼ 3:501 mol C12:01 g C1:651 1 mol H4:13 mol Hð4:16 g HÞ¼ 4:13 mol H¼ 2:50 mol H1:008 g H1:651 1 mol O1:651 mol Oð26:42 g OÞ¼ 1:651 mol O¼ 1:000 mol O16:00 g O1:651Multiplying all by 2 gives the empirical formula C 7 H 5 O 2 . The empirical formula mass is 121 g.molar massempirical formula mass ¼ 242 g121 g ¼ 2The molecular formula is twice that of the empirical formula.Molecular formula is (C 7 H 5 O 2 ) 2 ¼ C 14 H 10 O 438. Empirical and Molecular formulas of dixanthogen.29.73% C, 4.16% H, 13.20% O, 52.91% S; molar mass ¼ 242.4 g 1 mol C2:475 mol Cð29:73 g CÞ¼ 2:475 mol C¼ 3:000 mol C12:01 g C0:8250 1 mol H4:13 mol Hð4:16 g HÞ¼ 4:13 mol H¼ 5:01 mol H1:008 g H0:8250 1 mol O0:8250 mol Oð13:20 g OÞ¼ 0:8250 mol O¼ 1:000 mol O16:00 g O0:8250 1 mol S1:650 mol Sð52:91 g SÞ¼ 1:650 mol S¼ 2:000 mol S32:07 g S0:8250-64-