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- Modli ALI +2 www. IL DI MIUM RII ma Jr. CHEMISTRY 3) Balance of Hydrogen atoms CH(OH), +H,0+5OH Cro? +54,0 4) Balance of charges CH(OH), +50H+H, O-> CrO+SH,O+3e ... (1) Reduction half reaction 107 +1 1) Balance the atoms other than H and O آي 10 3) ***4.A carbon compound contains 12.8% carbon 2.1% Hydrogen 85.1% bromine. The molecular weight of the compound is 187.9 calculate the molecular formula A. A Element Atomic /At.wt Simple Weight ratio 12.8 1.067 с с 12.8 12 =1.067 = 1 12 1.067 2.1 2 H 2.1 1 = 2.1 1 1.067 85.1 1067 Br 85.1 80 =1.067 -1 80 1.067 Empirical formula = CH, Br Empirical formula weight = 12 + (2x 1) + 80 = 94 The molecular weight =1879 (given) molecular weight 187.9 n = 2 empirical formula weight 94 Molecular formula = (Empirical formula), (CH,Br), -C,H,BE 5. Calculate the oxidation state of following + Balance of oxygen atoms 10,-1+3H 0 Balance of Hydrogen atoms 10, +61,0-1°+3H,0 +60H Balance of charges 10, +6H,0-6e-+60H" +3H,0 .. (2) Balancing of electrons in both sides Adding the two half reaction (1 x 2) 2CH(OH), +100H +2H,0- 2CO, +10H,0+6e .. (3) ) 10, +6H,0 +61 +1 +60 +3,0 ..(4) cq3) + (4) 4) 12 ...
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