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What is the oxidation state of nitrogen (N) in ammonia (NH3)?
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6. Chemical Quantities & Aqueous Reactions
Calculate Oxidation Numbers
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What is the oxidation number of manganese in MnO2?
A
+3
B
+2
C
+4
D
+6
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Understand that the oxidation number is a concept used to describe the degree of oxidation of an atom in a chemical compound. It is often used to determine how electrons are distributed among atoms in a molecule.
Recognize that in MnO2, manganese (Mn) is combined with oxygen (O). Oxygen typically has an oxidation number of -2.
Set up an equation to find the oxidation number of manganese. Let the oxidation number of Mn be x. Since there are two oxygen atoms, their total contribution to the oxidation number is 2 * (-2) = -4.
Write the equation based on the fact that the sum of oxidation numbers in a neutral compound is zero: x + (-4) = 0.
Solve the equation for x to find the oxidation number of manganese: x = 4.
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