Ask Question
9 May, 12:04

Nitrogen gas can be prepared by passing ammonia over solid copper (II) oxide according to the equation2 NH3 + 3 CuO (s) - -> N2 (g) + 3 Cu (s) + 3 H2O (g) Suppose 18.1 grams of ammonia is reacted with 90.4 grams CuO.

a) What is the theoretical yield of nitrogen in grams? b) What is the theoretical yield of copper in grams? c) Which reactant is limiting?

+1
Answers (1)
  1. 9 May, 15:26
    0
    The theoretical yield of nitrogen is 10.64 grams

    The theoretical yield of copper is 72.44 grams

    CuO is the limiting reactant.

    Answer:

    Explanation:

    Step 1: Data given

    Mass of NH3 = 18.1 grams

    Mass of CuO = 90.4 grams

    Molar mass NH3 = 17.03 g/mol

    Molar mass CuO = 79.545 g/mol

    Molar mss of Cu = 63.546 g/mol

    Step 2: The balanced equation

    2NH3 + 3CuO (s) → N2 (g) + 3Cu (s) + 3H2O (g)

    Step 3: Calculate moles NH3

    Moles NH3 = mass NH3 / molar mass NH3

    Moles NH3 = 18.1 grams / 17.03 g/mol

    Moles NH3 = 1.06 moles

    Step 4: Calculate moles CuO

    Moles CuO = 90.4 grams / 79.545 g/mol

    Moles CuO = 1.14 moles

    Step 5: Calculate limiting reactant

    For 2 moles NH3 we need 3 moles CuO to produce 1 mol N2, 3 moles Cu and 3 moles H2O

    CuO is the limiting reactant. It will completely be consumed (1.14 moles).

    NH3 is in excess. There will react 2/3 * 1.14 = 0.76 moles

    There will remain 1.06 - 0,76 = 0.30 moles of NH3

    Step 6: Calculate moles of N2 and Cu

    For 2 moles NH3 we need 3 moles CuO to produce 1 mol N2, 3 moles Cu and 3 moles H2O

    For 1.14 moles of CuO we'll have 1.14 / 3 = 0.38 moles of N2 and 1.14 moles of Cu

    Step 7: Calculate mass of products

    Mass N2 = moles N2 * molar mass N2

    Mass N2 = 0.38 moles * 28 g/mol

    Mass N2 = 10.64 grams

    Mass Cu = 1.14 moles * 63.546 g/mol

    Mass Cu = 72.44 grams grams
Know the Answer?
Not Sure About the Answer?
Find an answer to your question ✅ “Nitrogen gas can be prepared by passing ammonia over solid copper (II) oxide according to the equation2 NH3 + 3 CuO (s) - -> N2 (g) + 3 Cu ...” in 📘 Chemistry if you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions.
Search for Other Answers