a) If 3.50 mol of Fe reacts with 3.00 mol of oxygen in the following reaction. 4

Question

a) If 3.50 mol of Fe reacts with 3.00 mol of oxygen in the following reaction. 4Fe(s)+3O2(g)-->2Fe2O3(s). Which of the following statements is correct?

1) O2 is the limiting reactant and 2.00 mol of product can be produced

2) O2 is the excess reactant and 2.00 mol of product can be produced

3) Fe is the limiting reactant and 1.75 mol of product can be produced

4) Fe is the excess reactant and 1.75 mol of product can be produced

b) A sample of a compound is decomposed in the laboratory and produces 120.1 g carbon, 30.2 g hydrogen, and 80.0 g oxygen. Calculate the empirical formula of the compound

Explanation / Answer

A. for one mole of Fe the reaction require 0.75 mole of O2, so , for 3.5 mol of Fe it required 3.5 x 0.75 = 2.625 mol of O2,

so, Fe is the limiting reagent. and mole of prdt formed will be 3.5/2 = 1.75 mol

so option 3 is correct.

b. 120.1 g carbon/12 = 10; 30.2 g Hydrogen/1.008 = 30 , 80 g Oxygen/16 = 5, so empirical formula = C12H30O5.

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