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Complete and balance the following reaction: 2CuO+3NH3тАЛтЖТ3Cu+N2тАЛ+3H2тАЛO Select the correct balanced equation:
3CuO+2NH3тАЛтЖТ3Cu+2N2тАЛ+3H2тАЛO
3CuO+2NH3тАЛтЖТ3Cu+N2тАЛ+3H2тАЛO
3CuO+2NH3тАЛтЖТ3Cu+N2тАЛ+4H2тАЛO
3CuO+2NH3тАЛтЖТ3Cu+N2тАЛ+4H2тАЛO
3CuO+2NH3тАЛтЖТ3Cu+N2тАЛ+4H2тАЛO
The reduction of copper(II) oxide by ammonia is a classic redox reaction where ammonia acts as a reducing agent and is oxidized to nitrogen gas, while copper oxide is reduced to copper metal. The correct balanced chemical equation for this reaction is 3CuO+2NH3тАЛтЖТ3Cu+N2тАЛ+3H2тАЛO.
The reduction of copper(II) oxide by ammonia is a classic redox reaction where ammonia acts as a reducing agent and is oxidized to nitrogen gas, while copper oxide is reduced to copper metal. The correct balanced chemical equation for this reaction is 3CuO+2NH3тАЛтЖТ3Cu+N2тАЛ+3H2тАЛO.
Think of it like a chemical trade: ammonia brings hydrogen and nitrogen. It gives its hydrogen to oxygen from copper oxide to form water, leaving behind pure copper and free nitrogen gas.
Remember 'Ammonia Reduces Metal Oxides' (ARMO) to elemental metal while releasing nitrogen and water vapor.
3CuO+2NH3тАЛтЖТ3Cu+N2тАЛ+3H2тАЛO тАФ Balanced overall redox reaction
Oxidation state change: N(тИТ3)тЖТN2тАЛ(0) and Cu(+2)тЖТCu(0)
In this reaction, copper changes its oxidation state from +2 in CuO to 0 in Cu (reduction), while nitrogen in ammonia changes its oxidation state from тИТ3 in NH3тАЛ to 0 in N2тАЛ (oxidation). To balance the nitrogen atoms and hydrogen atoms, 2 moles of NH3тАЛ react with 3 moles of CuO to produce 3 moles of copper, 1 mole of nitrogen gas, and 3 moles of water.
Copper(II) oxide (CuO) is black in color and gets reduced to shiny brown/red copper metal.
Ammonia (NH3тАЛ) acts as a strong reducing agent in this reaction.
Nitrogen gas (N2тАЛ) is evolved as a colorless gas.
Water (H2тАЛO) is formed as a byproduct.
Provides a clean method to produce pure copper metal from its oxide.
Demonstrates fundamental principles of redox chemistry and stoichiometry.
Requires careful control of temperature and gases.
Ammonia gas can be irritating and toxic at high concentrations.
Metallurgical extraction and purification processes.
Laboratory preparation and demonstration of redox reactions in competitive chemistry exams.
Option C is the correct balanced equation satisfying conservation of mass for copper, nitrogen, hydrogen, and oxygen atoms.
In option A, B, and D, either mass or atom counts for copper, hydrogen, or oxygen are unbalanced.
C is correct тАФ 3CuO+2NH3тАЛтЖТ3Cu+N2тАЛ+3H2тАЛO is the correctly balanced equation for the reduction of copper(II) oxide by ammonia.
Always verify equation balancing by counting atoms of each element on both sides: Reactants vs Products (e.g., Cu: 3 vs 3, N: 2 vs 2, H: 6 vs 6, O: 3 vs 3).
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