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A compound W consist of 26.7%carbon, 2.2% hydrogen and the rest oxygen. It has a relative formula Mass of 90(C=12, H=1, O=16,)

  1. Determine it empirical formula. 
  2. Workout its molecular formula

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  1. %oxygen =100 − (26.7 + 2.20)=71.1% 
                       C      H       O
    %comp. W  26.7  2.2   71.1
    R.A.M           12     1      16
    No. of moles 26.7  2.2   71.1
                         12     1      16
                        2.2    2.2     4.4  
                        2.2    2.2     4.4
                        2.1    2.2     2.2
                           1      1       2
    E. F is C1H1O2 = CHO2  
  2. (CHO2)n = 90  
    12n + n + 32n = 90
        45n = 90
            n=2 
    M.F is C2H2O
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