27. Which of the following compounds has the highest percent of iron by mass a.

Question

27. Which of the following compounds has the highest percent of iron by mass a. FeCl2 b. FeO c. Fe(OH)2 d. FeCls PERCENT COMPOSITION AND CHEMICAL FORMULAS 1. A sample of a compound analyzed in a chemistry laboratory consists of 5.34 g of carbon, 0.42 g 2. Find the percent composition of a compound containing tin and chlorine if 18.35 g of the 3. If 3.907 g of carbon combines completely with 0.874 g of hydrogen to form a compound, what is 4. From the formula for calcium acetate, Ca(C-HsO, calculate the mass of carbon that can be of hydrogen, and 47.08 g of chlorine. What is the percent composition of this compound? compound contains 5.74 g of tin. the percent composition of this compound? obtained from 65.3 g of the compound.

Explanation / Answer

1. percent composition, means

% of C = wt of carbon/Wt of sample*100

         = (5.34/(5.34+47.08+0.42))*100

         = 10.1%

% of H = wt of hydrogen/Wt of sample*100

         = (0.42/(5.34+47.08+0.42))*100

         = 0.795%

% of Cl = wt of hydrogen/Wt of sample*100

         = (47.08/(5.34+47.08+0.42))*100

         = 89.1%

2. Tin % = 5.74/18.35 *100 = 31.28%

    Cl = (18.35-5.74)/18.35*100= 68.72%

3. % of C = 3.907/(3.907+0.874)*100 = 81.72%

   % of H = 0.874/(3.907+0.874)*100 = 18.28%

4. molarmass of Ca(c2h3o2)2 = 158.17 g/mol

    158.17 g contains = 48 grams of C

     65.3 g contains = 65.3*48/158.17 = 19.82 g

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