chem

A sample of hexane was cracked. A sample of 50cm³ of gas was produced. The gas decolorized 4cm³ of 0.23moldm–³ solution of bromine. What % of alkenes was produced?

  1. 👍 0
  2. 👎 0
  3. 👁 57
asked by jay
  1. millimoles Br2 used = mL x M = 4*0.23 = approx 0.9
    1 mol Br2 adds to 1 mol alkene; therefore, mmols Br2 alkene = approx 0.9.
    mols in 50 cc at stp = 50/22,400 and millimols = 50*1000/22,400 = approx 2.
    % alkene = (mmols alk*100/mmols gas) = ?
    % alk = mols alkene/

    1. 👍 0
    2. 👎 0
  2. thanks Drbob222

    1. 👍 0
    2. 👎 0
    posted by jay

Respond to this Question

First Name

Your Response

Similar Questions

  1. chem

    A sample of hexane was cracked. A sample of 50cm³ of gas was produced. The gas decolorized 4cm³ of 0.23moldm–³ solution of bromine. What % of aliens was produced?

    asked by jay on April 13, 2016
  2. chemistry

    1)A sample of CO2 gas which weighs 0.85 grams has a volume of 1.30 liters when collected at 30°C. What would be the pressure of the gas sample? 2) A gas sample has an original volume of 600 ml when collected at 720 mm and 35°C.

    asked by Anonymous on April 22, 2014
  3. science: chemistry

    When a sample of potassium nitrate is heated, oxygen gas is produced. This gas, collected in a 750 milliliter flask, has a pressure of 2.8 atmosphere and the temperature is recorded to be 53.6°C. How many moles of oxygen gas are

    asked by Jane Doe on July 15, 2011
  4. Chemistry

    When a sample of potassium nitrate is heated, oxygen gas is produced. This gas, collected in a 750 milliliter flask, has a pressure of 2.8 atmosphere and the temperature is recorded to be 53.6°C. How many moles of oxygen gas are

    asked by Brina on April 16, 2014
  5. Chemistry

    a sample of helium gas is in a closed system with a movable piston. the volume of the gas sample is changed when both the temperature and the pressure of the sample are increased. the table below shows the initial temperature,

    asked by Shanee on April 19, 2011
  6. Chemistry

    A sample of methane (CH4) gas contains a small amount of helium. Calculate the volume percentage of helium if the density of the sample is 0.70902 g/L t 273K and 1.00 atm. I know that the sample is at STP and that the 1 mole of

    asked by Chris on October 29, 2014
  7. SchoolCraft

    A gas sample undergoes a reversible isothermal expansion. The figure gives the change ΔS in entropy of the gas versus the final volume Vf of the gas. The scale of the vertical axis is set by ΔSs = 68.4 J/K. How many moles are in

    asked by Anonymous on June 1, 2016
  8. Physics

    A sample of 8.02×10^−1 moles of nitrogen gas (γ =1 .40) occupies a volume of 2.00×10^−2 m^3 at a pressure of 1.00×10^5 Pa and temperature of 300K. The sample is isothermally compressed to exactly half its original volume.

    asked by Anon on March 20, 2018
  9. chemistry

    a sample containing 1.50 mol neon gas has a volume of 8.00L.what is the new volume of the gas in liters when the following changes occur in the quantity of the gas at constant pressure and temperature? a.a leak allows on-half of

    asked by Jetta on June 27, 2010
  10. Chemistry

    A 0.642 g sample of an unknown gas was collected over water at 25 C and 1.04 atm. The collection cylinder contained 151.3 mL of gas after the sample was released. Find the molar mass of the unknown gas?

    asked by Anonymous on April 27, 2015

More Similar Questions