1. Questions

*Chemistry

Hydrogen reacts w/ sodium to produce solid sodium hydride, NaH. A reaction mixture contains 6.75 g Na and 3.03 g H2.
A. Which reactant is limiting?
B. What is the theoretical yield of NaH from the above reaction mixture?
C. What is the percent yield if 4 g NaH is formed?


Laura, write the balanced equation:
2Na + H2 >>2NaH

It takes twice as many moles of sodium as hydrogen..
Figure the moles of sodium and hydrogen from the masses? If you have more than twice the moles of sodium as hydrogen, then the limiting reagent is hydrogen..think that out.
Now using the actual number of moles of the limiting reageant, what is the moles of product from the balanced equation?

I will be happy to critiqe your thinking.

  1. 👍
  2. 👎
  3. 👁
  4. ℹ️
  5. 🚩
Laura

  1. 2Na + H2 -> 2NaH

    A. Trial 1:

    n(Na) = mass/molar mass
    n = 6.75/22.99
    n = 0.294

    n(Na):n(H2):n(NaH)
    =2:1:2
    =0.294:0.147:0.294

    Trial 2:

    n(H2) = mass/molar mass
    n = 3.03/1.01
    n = 3

    n(Na):n(H2):n(NaH)
    =2:1:2
    =6:3:6

    0.294<6
    Therefore Na is the limiting reactant.

    B. Theoretical yield:

    (To reiterate)

    n(Na) = mass/molar mass
    n = 6.75/22.99
    n = 0.294

    n(Na):n(H2):n(NaH)
    =2:1:2
    =0.294:0.147:0.294

    n(NaH) = 0.294

    mass = n(molar mass)
    m = 0.294(22.99 + 1.01)
    m = 0.294(24)
    m = 7.056g

    Therefore, theoretical yield = 7.056g

    C. %yield = actual yield/theoretical yield
    %yield = 4/7.056
    %yield = 0.567 = 56.7%

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
    Anonymous

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    2Na + Cl2 → ?NaCl In the reaction, sodium and chlorine combine to produce sodium chloride. In an instance when eight sodium chloride molecules are produced, how many diatomic chlorine molecules went into the reaction? eight one

  2. Chemistry Connexus

    Conservation of mass apply Use the chemical equation to answer the question. 2Na + Cl2 → ?NaCl In the reaction, sodium and chlorine combine to produce sodium chloride. In an instance when eight sodium chloride molecules are

  3. Chemistry

    13. Solid sodium reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. How many molecules of hydrogen gas are formed when 48.7 g of sodium are added to water? 2Na + 2H2O = 2NaOH + H2 So far I have this

  4. Chemistry Balancing Equations

    Can you please tell me if these are correct? 1. Sodium Hydrogen Sulfite reacts with hydrochloric acid to produce sulfur dioxide gas, water and sodium chloride NaHSO3 + HCl -----> SO2 + H2O + NaCl 2. Sodium nitrate reacts with

  1. chemistry

    Aqueous sodium sulfate reacts with aqueous barium chloride to produce solid barium sulfate and aqueous sodium chloride. the solution contains 3.44g of barium chloride. you have a 0.282M solution of sodium sulfate. determine the

  2. chemistry

    sodium oxide reacts with carbon dioxide to form sodium carbonate. How much carbon dioxide is needed to produce 79g or sodium carbonate?

  3. Chemistry

    Write the following into a balanced equation. a) When a mixture of copper (II) oxide and carbon is heated, elemental copper forms and carbon monoxide evolves into the atmosphere. b) When a concentrated solution of sodium hydroxide

  4. chemistry

    Write the balanced chemical equation for the reaction of sodium bicarbonate with aqueous acetic acid to produce carbon dioxide, water, and sodium acetate. Follow the example set by the sodium bicarbonate.

  1. Chem

    A mixture of 5.00 g of sodium carbonate, Na2CO3 and sodium hydrogen carbonate, NaHCO3 is heated. The loss in mass is 0.31 g. Sodium carbonate does not decompose on heating. Calculate the percentage by mass of sodium carbonate in

  2. chemistry

    Sodium metal and water reacts to form hydrogen and sodium hydroxide. If 5.98g of sodium react with water to form .26g of hydrogen and 10.40g of sodium hydroxide, what mass of water was consumed in the reaction?

  3. Chemistry

    A 10.00 gram solid sample consisting of a mixture of sodium chloride and potassium sulfate is dissolved in 100.0 mL of water is combined with another 200.0 mL solution that contains excess aqueous lead(II) nitrate. Upon mixing the

  4. chemistry

    2Na + Cl2 - ?NaCI In the reaction, sodium and chlorine combine to produce sodium chloride. In an instance when eight sodium chloride molecules are produced, how many diatomic chlorine molecules went into the reaction?

View more similar questions or ask a new question.