A. Iron metal is produced from iron (III) oxide in the following reaction. What

Question

A. Iron metal is produced from iron (III) oxide in the following reaction.   What is reducing agent in this reaction?

       Fe2O3 + 3C ? 2Fe + 3CO

B. When the equation below is balanced, the coefficient for HNO3 is:

Al(OH)3 + HNO3 ? Al (NO3)3 + H2O

C. What is the coefficient of magnesium in the redox reaction below? (the reaction is unbalanced)

Mg + FeCl3 ® Fe + MgCl2

D. A sample of the antacid Amphojel containing of Al(OH)3 is titrated with HCl. How much Al(OH)3 is in the original sample if 192 ml of 0.1 M HCl are required to neutralize the sample? Write a balanced equation for the reaction. Give your final answer in grams of Al(OH)3.

Explanation / Answer

A.) oxidation state of Fe is reduced to 0 from +3. So, it reduced then reducing agent is carbon in the given reaction.

B.) Balance equation -- 3 HNO3 + Al(OH)3 ? Al(NO3)3 + 3 H2O

so, the coefficient of HNO3 = 3 in balanced reaction.

C.) Balanced equation -- 3 Mg + FeCl3 = Fe + 3 MgCl

coefficient of magnesium in the redox reaction = 3

D.) Balanced equation--- AL(OH)3 + 3 HCl = ALCl3 + 3 H2O

mmol of HCl = 192 x 0.1 = 19.2 mmol

mmol of Al(OH)3 = 19.2/3 = 6.4 mmol

mass of Al(OH)3 = 6.4 x 10^3 x 78 gram = 0.499 gram

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