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How many grams O2 are needed to react completely with 2.60 mole FeS, in this reaction?       4 FeS...

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Chemistry

  1. How many grams O2
    are needed to react completely with 2.60 mole FeS, in thisreaction?      
    4 FeS + 7 O2→2 FeO3 + 4 SO2

    1.28 x 10 3
    g

    0.258 g

    329 g

    44.1 g

    3.90 x 10 3 g

    146 g

    74.7 g

    1.81 g

  2. How many g of Aluminum are needed to react completely with 12.5mole of Br2, according to the chemical equationbelow?
    2Al + 3Br2→Al2Br6

    36.6 g

    310 g  

    225 g  

    1.42 g


    145 g

  3. How many g of Aluminum are needed to react completely with 0.850gram of Mn3O4, according to the chemicalequation below?
    3 Mn3O4   + 8 Al --> 9Mn    +    4Al2O3

    0.267 g

    79.2 g   

    20.3 g

    151 g

    13.3 g   

    86.5 g   

    14.2 g

    3.70 g   

  4. Refer to this equation:
    3SCl2(l) + 4NaF(s) →SF4(g) +S2Cl2(l) + 4NaCl(s)
    12.0 grams SCl2 is reacted and 3.05 grams ofSF4 is formed. What is percent yieldSF4?
      
    Hint: find theoretical yield
    Hint: percent yield =(actual yield/ theoretical yield) x 100

    19.3 %

    64.4%

    38.0%

    27.2 %

    82.1%

    72.7%

    90.1%

    58.6%

  5. Look at the following equation:   
       3H 2 +   N 2->   2 NH 3

    If 85.0 gram of N 2 gives 86.2 g of NH 3,what is the percent yield of
    NH 3?
    Hint: find theoretical yield
    Hint: percent yield =(actual yield/ theoretical yield) x 100

    71.7 %

    69.2 %

    93.0%

    45.1%

    83.5 %

    36.1%

    79.2%

    71.9%

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