RE: #Chemistry Challenge 5

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#Chemistry Challenge 5

in steemstem •  7 years ago  (edited)

I am just lazy so I use chemdraw to generate the molecular weigh LOL

More explanation on
Q3)
mole of CO2 = 1596.78 mole
implies mass of CO2 = 1596.78 * 44 = 70258 g = 70.26 kg
I use the given R btw
Q4
I thought the v(C8H18) where the v means volume LOL, but now i guess probably you mean speed
I would take rate of reaction as concentration over time usually, but I don't have concentration here, so I guess you are looking for change of mole per unit time?
If this is the case, here would be my answer:
5 L/ hr implies 32.89 mol/hr

steemstem
7 years ago by

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      ·  7 years ago (edited)

    Yes, right, but first you had another volume and also another mass of CO2. Better is to add a new comment if you change any parts of your solutions.

    Concerning part 4: if any information seems to be missing you can use every given detail from parts 1 to 3 to find it out.
    So far your answer is wrong.

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      ·  7 years ago 

    How about:
    v(C8H18) = - 32.89 mol/hr

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      [-]
        ·  7 years ago (edited)

      NOT correct! :-)

      But apart from that so far you did well ... :)

      Edit: by the way, the reaction speed v is not negative (even if ∆c is negative), but that's not the point: your number is wrong, too.

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        [-]
          ·  7 years ago 

        humm... if you are expecting the answer in concentration:
        [CO2] = 4.734 x 10-2 mol dm-3
        implies rate of CO2 production = 6.7 x 10-3 mol dm-3 hr-1
        implies speed of dissipating isooctane = 8.37 x 10-4 mol dm-3 hr-1

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          [-]
            ·  7 years ago 

          Thanks for letting us know about the concentration of carbon dioxide.

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          1 vote
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            ·  7 years ago (edited)

          How exactly do you get
          c(CO2) = 4.734 x 10-2 mol/dm3?

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            [-]
              ·  7 years ago (edited)

            Nah.... sorry for getting so many typo
            [CO2] = 1596.78 mol / 3.92 x 10 4 dm3
            = 4.0734 x 10-2 mol dm-3
            But the rest should be the same

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              [-]
                ·  7 years ago (edited)

              :)
              This result is the (lower) concentration of CO2 when it was emitted as a gas already ... but gasoline is a liquid ...

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                [-]
                  ·  7 years ago 

                Ya, so why I am wondering what unit you are expecting
                Speed of reaction: defined as how quickly or slowly a reaction takes place
                (So my very initial attempt was in liter per hour)

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