anonymous
  • anonymous
Acetic acid contains carbon,hydogen and oxygen. 4324g of sample acetic acid on complete combustion gave 6.21g of CO_2 and 2.54g of H_2O. The Molecular mass of acetic acid is 60. Find (i) Empirical formula of acetic acid (ii) Molecular formula of acetic acid
Chemistry
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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.Sam.
  • .Sam.
Can you draw a table for finding empirical formula?
anonymous
  • anonymous
Step 1 = % of elements Step 2 =Mole Ratio step 3 = Simplest Ratio Step 4 = Establishing emp. formula
anonymous
  • anonymous
Although i am good at this........but this question is crazy....cant just get it done

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anonymous
  • anonymous
Example Question : 1.8g of an organic compound on combustion gave 3.21g CO2 AND 1.322g H2O. Calculate Empirical Formula. Step 1 % of elements : C= 12/44 * 3.21/1.8 * 100 = 48.63% H=2/18*1.322/1.8 * 100 = 8.16 % O = 100-(48.63+8.16)=43.21% Step 2 Mole Ratio : C= 48.63/12 = 4.05 H= 8.16/1 = 8.16 O= 23.21/16 = 2.7 Step 3 Simplest Ratio : C=4.05/2.7 = 1.5 H=8.16/2.7 = 3 O=2.7/2.7 In order to get nearest whole no. ratio,all are multiplied by 2 Hence C=3 , H=6 , O=2 Step 4 Establishing Empirical Formula: C_3H_6_O_2
anonymous
  • anonymous
^here is a example
anonymous
  • anonymous
but the question i've asked is similar to this but it is entirely different ...it is giving crazy simplest ratio
.Sam.
  • .Sam.
Hold on
anonymous
  • anonymous
okay
mos1635
  • mos1635
4324g of sample acetic...... is the number correct?????
anonymous
  • anonymous
yes it is
mos1635
  • mos1635
1,69 gr C 0.28 gr H 4324-1,69-0.28=4322.03 gr of oxyxen !!!!! something is wrong!!!
anonymous
  • anonymous
it is from a question paper....and it is correct
mos1635
  • mos1635
is CO2 and H2O in gr or in Kgr ????
anonymous
  • anonymous
anonymous
  • anonymous
it is the 1st question i've asked
mos1635
  • mos1635
i see it. i still thing the numbers are wrong. try to take CO2 and H2O in Krg to see if it make sense....
anonymous
  • anonymous
4.324 kg acetic acid will produce only 6.21 g of CO2 and 2.54 H2O . Not possible, I think.
anonymous
  • anonymous
okay....this is what i think since you know the compound is acetic acid, then you should know it has a molecular formula C2H4O2 and an empirical formula of CH2O.....

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