Chelsey asked in Science & MathematicsChemistry · 1 decade ago

Write a balanced equation? C3H8 + O2 --> CO2 + H2O [These numbers are subscripts.]?

Please show your work...I'm so lost.

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  • 1 decade ago
    Favorite Answer

    very easy.

    2C3H8+7O2 --> 3CO2+8H2O

    C 3/6 C2/6

    H 8/16 H2/16

    O 2/14 O3/14

    I find it works if you add up how many of each lelment you have on the bottom, and as you add numbers and the multiply against the subscripts, to keep a running tally. I hope this helps you out. This kind of thing is hard to show work on. :)

    Source(s): I have taken Quantitative Physical Sci.
    • 5 years agoReport

      Fix your Carbons

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  • 1 decade ago

    C3H8+ 5O2 -> 3CO2 + 4H2O

    As you can see is a more math problem than a chemistry

    problem.

    The key is the C3H8 because there we have 3 C and 8 H = 4H2 which must be found at the right side of the equation.

    That's why we put 3 before CO2 and 4 before H2O.

    If you add all the O at the right side you will find 10 O =5O2

    and thats why we put 5 at the left side before O2.

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  • Anonymous
    1 decade ago

    There is a nice trick to write the oxidation of hydrocarbons.

    lets c...

    C3H8 has 3 carbon atoms. thus it will give 3CO2 on burning.

    C3H8 has 8 H atoms. thus it will give 4(half of 8) H2O atoms.

    Now balance the oxygen by seeing.

    thus the balanced Rxn is ::

    C3H8 + 5O2 ------------->> 3CO2 + 4H2O

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  • Diana
    Lv 4
    4 years ago

    For the best answers, search on this site https://shorturl.im/axB9d

    Now can someone balance this please? MgCl2 + NaCO3 --> MgCO3 + NaCl Yes, I can, but you need to get the correct formulas written first. That may be part of the reason you can't balance it. Sodium carbonate is Na2CO3, not NaCO3. Here is the correct equation: MgCl2 + Na2CO3 --> MgCO3 + 2NaCl If you were in my class, I would also make you include the state symbols. Impress your teacher and do that. MgCl2(aq) + Na2CO3(aq) --> MgCO3(s) + 2NaCl(aq) Now you can see what is actually driving this double replacement reaction. It is the formation of an insoluble product. In this case magnesium carbonate.

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  • 1 decade ago

    OK that person (2nd answerer) that said very easy is wrong, just so you know. Combustion equation(not like that's relevant at all)!

    Start: C3H8+O2 --> CO2 + H2O

    > 3C1

    > 8H2

    > 2O3

    C3H8+O2 --> 3CO2 + H2O

    > 3C3

    > 8H2

    > 2O7

    C3H8+O2 --> 3CO2 + 4H2O

    > 3C3

    > 8H8

    > 2O10

    Final: C3H8+5O2 --> 3CO2 + 4H2O

    > 3C3

    > 8H8

    > 10O10

    Get it?

    Hope this helps!

    Source(s): My Chem Class
    • Mike6 years agoReport

      very helpful! thanks

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  • C3H8+5O2------>3CO2+4H2O

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  • E = MC2 = 2 PTS

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