Manganese commonly occurs in nature as a mineral. The extraction of manganese fr

Question

Manganese commonly occurs in nature as a mineral. The extraction of manganese from the carbonite mineral rhodochrosite, involves a two-step process. In the first step, manganese (II) carbonate and oxygen react to form manganese (IV) oxide and carbon dioxide: 2MnCO,(s)+02(9)-+2 Mno2(s)+2CO2(9) In the second step, manganese (IV) oxide and aluminum react to form manganese and aluminum oxide: 3MnO2(5)+4 Al(s)-+3 Mn(s)+2 Al,0,(s) Write the net chemical equation for the production of manganese from manganese (I1) carbonate, oxygen and aluminum. Be sure your equation is balanced

Explanation / Answer

Ans. Reaction 1:        2 MnCO3(s) + O2(g) --------> 2 MnO2(s) + 2 CO2(g)

Reaction 2:                 3 MnO2(s) + 4 Al(s) ---------> 3 Mn(s) + 2 Al2O3(s)

# Note that MnO2 is at the left side of reaction 1, and at right side of reaction 2. So, it shall be cancelled out in the overall balanced reaction as follow –

# Step 1: Multiply reaction 1 by 3 , and reaction 2 by 2 –

            6 MnCO3(s) + 3 O2(g) --------> 6 MnO2(s) + 6 CO2(g)

            6 MnO2(s) + 8 Al(s) ---------> 6 Mn(s) + 4 Al2O3(s)

# Step 2: Add the above reactions to get the overall balanced reaction -

6 MnCO3(s) + 3 O2(g) --------> 6 MnO2(s) + 6 CO2(g)

6 MnO2(s) + 8 Al(s) ---------> 6 Mn(s) + 4 Al2O3(s)

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6 MnCO3(s) + 3 O2(g) + 8 Al(s) ------> 6 CO2(g) + 6 Mn(s) + 4 Al2O3(s)      - Overall balanced reaction

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