Chemistry

(I corrected it )

1. Sodium and water react according to the following equation. If 31.5g of sodium are added to excess water, how many liters of hydrogen gas are formed at STP?
2Na+2H2O—>2NaOH+H2

My work: For #1 Na would have 2 moles and H would have 1? Make 31.5g x 2/1=63? Or 31.5g divided by 2 x 1= 15.7?

(If im wrong can you help me)

2. Sodium reacts with oxygen to produce sodium oxide as described by the balanced equation below. If 54.1g of sodium reacts with excess oxygen gas to produce 61.8g Of sodium oxide, what is the percent yield? (Hint: be sure to calculate theoretical yield first)
4Na+O2–>2Na2O

I’m having trouble solving #2 can someone give me a format on how to solve for the theoretical yield.
I know how to solve the problem just not the theoretical yield that’s the part I’m struggling on.
I’m not sure but I think the equation is already balanced. (If not can someone tell me so I can correctly try to fix it)

  1. 👍
  2. 👎
  3. 👁
  1. 1. molar mass of Na is 23.0 g

    moles of Na = 31.5 / 23.0

    moles of H2 is half of Na
    ... from reaction equation

    a mole of ANY gas is 22.4 L at STP

    2. the equation is balanced

    theoretical is what you get if ALL the sodium reacts with oxygen to form sodium oxide

    54.1/23.0 moles of Na, theoretically yields 54.1/46.0 moles of Na2O
    ... molar mass of Na2O is 62.0 g

    find the theoretical product mass and compare it to the actual to get the % yield

    1. 👍
    2. 👎
  2. These questions both come from an online school chemistry test. This student is violating our honor code. Please stop helping students cheat by simply giving them the answers.

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. chemistry

    What mass in grams of sodium hydroxide is produced if 20.0 g of sodium meal reactts with excess water according to the chemical equation 2 Na(s)+2 H2O(l)=2 NaOH(aq)+H2(g)?

  2. Chemistry

    Describe how you would obtain pure crystals of Sodium chloride from a muxture of solid sodium chloride and solid zinc carbonate Step1 Step 2 Step 3 1. Add HCl to react with the carbonate. The products are zinc chloride, CO2, and

  3. chemistry

    how do i write a net ionic equation for Lead (II) Nitrate and Sodium Carbonate react to form Lead Carbonate and Sodium Nitrate??

  4. chemistry

    1. You begin pouring sodium chloride into a glass of water. For a long time, the sodium chloride just dissolves in the water, but suddenly it begins to pile up at the bottom of the glass. Which statement is true? o A. The sodium

  1. 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?

  2. Chemistry

    Sodium oxide, reacts with water to give NaOH. A) Write a balance equation? B)What is the pH of the solution prepared by allowing 1.55 g of Na2O to react with 500.0 ml of water? (assume there is no volume change) C) How many

  3. chemistry

    Sodium peroxide reacts vigorously with water to produce sodium hydroxide and oxygen. The unbalanced equation is Na2O2(s) + H2O(ℓ) −! NaOH(aq) + O2(g) What mass of O2 is produced when 24 g of Na2O2 react? What mass of water is

  4. Chemistry

    A particular vinegar contains 4.0% CH3COOH by mass. It reacts with sodium carbonate to produce sodium acetate, carbon dioxide, and water. How many grams of carbon dioxide are produced by the reaction of 5.00 mL of this vinegar

  1. Chemistry

    I wrote the balanced equation for cream of tartar and baking soda: NaHCO3+KHC4H4O6->KNaC4H4)6+H2CO3 I identified the conjugate acid base pairs: NaHCO3 and H2CO3, KHC4H4O6 and KNaC4H4O6 I wrote a balanced equation for carbon

  2. Chemistry ( I NEED HELP, PLEASE!!!, IM DESPERATE!)

    Sodium peroxide reacts vigorously with water to produce sodium hydroxide and oxygen. The unbalanced equation is Na2O2(s) + H2O(ℓ)→ NaOH(aq) + O2(g). What mass of O2 is produced when 81 g of Na2O2 react?

  3. 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.

  4. chemisrty

    Consider the reaction between sodium metal and chlorine gas to form sodium chloride (table salt). 2Na(s) + Cl2(g) 2NaCl(s) If 3.6 moles of chlorine react with sufficient sodium, how many grams of sodium chloride will be formed?

You can view more similar questions or ask a new question.