Consider again the thermite reaction. if 0.0257 g al react completely, what mass of fe forms? use the periodic table to find molar masses. fe2o3 + 2al → al2o3 + 2fe select the correct setup for this calculation.

 The mass  of  Fe that  is formed  is 0.0532 grams

  Explanation

Fe2O3  + 2 Al → Al2O3  + 2 Fe

Step 1: find the moles of Al

   moles  =  mass/molar mass

from periodic table  the molar mass of Al= 27 g/mol

 moles = 0.0257g /27 g/mol =9.5 x10^-4  moles  of Al

Step 2:   use the mole ratio  to  determine the moles of Fe

 the  moles ratio of Al:Fe   is 2:2= 1:1

therefore  the moles of Fe is also =  9.5 x10 ^-4 moles

Step 3: find the mass of Fe

mass= moles  x molar mass of Fe

from periodic table the molar  mass of Fe=  56 g/mol

mass= 9.5 x10 ^-4 moles  x 56 g/mol =0.0532  grams

is C/ the 3rd one

Explanation:

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