Ask questions and get helpful responses.
Ask a New Question
  1. Questions

Chemistry

How much heat is absorbed/released when 20.00 g of NH2 reacts in the presence of excess O2 to produce NO and H2O according to the following chemical equation:
4NH3 + 5O2 --> 4NO + 6H2O, deltaH= +1168 kJ.

The answer is 342.9 kJ of heat absorbed. I want to know how to complete this problem.

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

  1. I figured it out, deltaH is in kJ/grams which is 68. So 20.0gx(1168kJ/68g)=342.9 kJ.

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

  2. Yes, or you could have converted 20g to mols which is 20/17 = 1.176, then
    1168 kJ/4mol = 292 kJ. Then 292 x 1.176 = 343 kJ

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
    DrBob222

Respond to this Question

First Name

Your Response

Similar Questions

  1. CHEM

    2H2+O2=2H2O H=-484KJ Which answer best describes the transfer of heat that occurs when 1.41 mol of H2 reacts with 0.671 mol of O2? 341 kJ released 484 kJ released 341 kJ absorbed 484 kJ absorbed 325 kJ released 325 kJ absorbed

  2. Chemistry

    2H2+O2 -> 2H20 changeHrxn=-484 KJ Which answer best describes the transfer heat that occurs when 1.30 mol of H2 reacts? 629 KJ released 315 KJ absorbed 315 KJ released 484 KJ absorbed 484 KJ released 629 KJ absorbed

  3. chemistry

    When hydrogen peroxide (H2O2) is used in rocket fuels, it produces water, oxygen, and heat. 2H2O2(l)⟶2H2O(l)+O2(g)ΔH=−196kJ How many kilojoules are released when 2.65 moles of H2O2 reacts? How many kilojoules are released

  4. Chemistry

    When 0.250 mol of CH4(g) reacts with excess Cl2(g) at constant pressure according to the chemical equation shown below, 177 kJ of heat are released. Calculate the value of Delta H for this reaction, as written.

  1. chemistry

    How many kilojoules of heat are released when 38.6g of CH4 reacts completely with O2 to form CH3OH at constant pressure?

  2. chemistry

    Consider the reaction, C2H4 (g) + H2 (g)- C2H6 (g) where -137kJ of heat is released. How many kilojoules are released when 55.3g of C2H4 reacts?

  3. Science

    What occurs when a substance melts? 1) It changes from solid to liquid, and heat is absorbed. 2) It changes from solid to liquid, and heat is released. 3) It changes from liquid to solid, and heat is absorbed. 4) It changes from

  4. chemistry

    How much heat will be released if 30 g of octane is burned in excess of oxygen? C8 H18 + 12.5 O2 yields 8CO2 + 9H2O Delta H= -5483.4 kJ

  1. Chemisty

    The value of ∆Ho for the reaction below is -1107 kJ: 2Ba(s) + O2(g) → 2BaO(s) How many kJ of heat are released when 15.75 g of Ba(s) reacts completely with oxygen to form BaO(s)? A) 35.1 B) 114 C) 70.3 D) 20.8 E) 63.5

  2. Physics

    A 0.4 kilogram sample of Aluminum at 115 degrees Celsius is put into a container containing 0.5 kilograms of water at 15 degrees Celsius. Neglecting the small amount of energy absorbed by the container and knowing that the

  3. Chemistry

    For the chemical reaction shown below, select the best answer. H2 + O2 + Br2 ----> HBrO A. some energy will be released and some energy will be absorbed with the reaction occurs, but more energy will be absorbed than will be

  4. Chemistry

    Calculate the heat change at 100C in each of the following problems.Indicate whether heat was absorbed or released. a. calories to condense 10.0 g of steam b. kilocalories to condense 75g of steam c. kilocalories to vaporize 44 g

Still need help? You can ask a new question.