Chemistry

posted by .

.Question part Points Submissions 1
0/0.5
2/3
Total 0/0.5 ...In the explosion of a hydrogen-filled balloon, 0.75 g of hydrogen reacted with 6.9 g of oxygen to form how many grams of water vapor? (Water vapor is the only product.)


i already posted this but i don't think people understood. isnt it because the law of conservation of mass that u just add the grams? but then i tried that and it was wrong. please help!

  • Chemistry -

    This is a limiting reagent problem and it errs when it states that "0.75 g hydrogen reacts with 6.9 g oxygen" because not all of the oxygen reacts.
    Write the equation and balance it.

    2H2 + O2 ==> 2H2O

    2a. Convert 0.75 g H2 to moles. moles = grams/molar mass.
    2b. Convert 6.9 g oxygen to moles the same way.

    3a. Using the coefficients in the balanced equation, convert moles hydrogen to moles H2O.
    3b. Same procedure, convert moles oxygen to moles H2O.
    3c. In limiting reagent problems, the answer for 3a and 3b are not the same; therefore, one of them must be wrong. The correct answer in limiting reagent problems is ALWAYS the smaller one and the reactant producing that value is the limiting reagent.

    4. Using the correct answer from 3c, convert mole H2O to grams H2O. moles x molar mass = grams.
    I arrived at an answer of about 6.75 g H2O produced but I estimated here and there. You need to confirm that.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry

    In the explosion of a hydrogen-filled balloon, 0.75 g of hydrogen reacted with 6.9 g of oxygen to form how many grams of water vapor?
  2. chem

    In the explosion of a hydrogen-filled balloon, 0.54 g of hydrogen reacted with 6.6 g of oxygen to form how many grams of water vapor?
  3. AP Chemistry

    Small quantities of hydrogen gas can be prepared in the laboratory by the addition of aqueous hydrochloric acid to metallic zinc. Zn(s)+2HCl(aq) -> ZnCl2(aq)+ H2(g) Typically, the hydrogen gas is bubbled through water for collection …
  4. Chemistry

    In the explosion of a hydrogen filled balloon, 0.50 g of hydrogen reacted with 4.0 g of oxygen to form how many grams of water vapor?
  5. chemistry

    In the explosion of a hydrogen-filled balloon, 0.30g of hydrogen reacted with 2.4g of oxygen to form how many grams of water vapor?
  6. Chemistry

    In the explosion of a hydrogen-filled balloon, 0.80g of hydrogen reacted with 6.4g of oxygen. How many grams of water vapor are formed?
  7. chemistry

    In the combustion of hydrogen gas, hydrogen reacts with oxygen from the air to form water vapor. If you burn 54.8 g of hydrogen and produce 4.90 × 102 g of water, how much oxygen reacted?
  8. chemistry

    Hydrogen gas produced by this reaction is typically collected via water displacement, during which time the hydrogen gas becomes saturated with water vapor. If 238.4 mL of gas with a total pressure 1.27 atm was collected via water …
  9. Chemistry

    When a balloon filled with 1.249 g of hydrogen explodes, the hydrogen reacts with 9.99 g of oxygen to form water vapor. Assuming water vapor is the only product formed, how much water vapor is produced?
  10. Chemistry

    A sample of hydrogen gas (H2) is produced in a laboratory by displacement of water. A 645 mL sample of hydrogen is collected at 25 degrees Celsius and a total pressure of 758 torr. Collecting gas by water displacement causes the gas …

More Similar Questions