A raindrop contains about 0.05 gram of water a) how many molecules of a water are there in a drop b) how many hydrogen atoms are in a drop c) how many oxygen atoms are in a drop what is the empirical formula of the compound that contains 53.73% iron and 46.27% sulfur. please answer to the question

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Answers

2016-05-07T13:53:17+05:30
1. 18 grams of water contains= 6.02*10^23 molecules.
    0.05 grams of water contains= 6.02*10^23*0.05/18= 1.67*10^21                  molecules. (ans.)

2. 1 molecule of water contains= 2 atoms of hydrogen.
    1.67*10^21 molecules of water contains= 2*1.67*10^21= 3.34*10^21          atoms of hydrogen. (ans.)

3. 1 molecule of water contains= 1 atoms of oxygen.
    1.61*10^21 molecules of water contains= 1.67*10^21 atoms of                   oxygen. (ans.)

4. Element   Percentage   Atomic Weight   Percentage/at.wt. Least Ratio
     Fe           53.73            56                      53.73/56=0.95       0.95/0.95=1
     S             46.27            32                      46.27/32=1.44     1.44/0.95=1.5
     (continuation of the table) 
      Simple Ratio
      2*1=2  
      2*1.5=3 
Therefore, empirical formula of the compound is Fe2S3.







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