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March 28, 2017

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Aspirin (C9H8O4) is synthesized by reacting salicylic acid (C7H6O3) with acetic anhydride (C4H6O3). The balanced equation is given below.
C7H6O3 + C4H6O3 C9H8O4 + HC2H3O2

What mass of acetic anhydride is needed to completely consume 3.60 x 10^2 g salicylic acid?

i worked out the problem and got 270 but the answer is 370. here is my work.


360g C7H6O3 x 1 mol C7H6O3/138.118 g C7H6O3 x 1 mol C4H6O3/ 1 mol C7H6O3 x 102.088 g C4H6O3/1 mol C4H6O3 = 270g C4H6O3


sorry that looks really confusing but is there something wrong with my conversion factor??

  • chemistry - ,

    Your work would not look so confusing if you used parentheses. For example,
    360 g C6H7O3 x (1 mol C6H7O3/138.118) x .....
    Your work looks ok, however, I ran this on my calculator and obtained 266.08 grams. (I also used 138.123 instead of 138.118 but I don't think that will make any significant difference). Are you keying this into a database? If so, and 266 doesn't work, I would try 2.66 x 10^2 since the problem was given in scientific notation.

  • chemistry - ,

    I agree with you, mol masses 138 and 102
    C7H6O3 + C4H6O3 ---> C9H8O4 + HC2H3O2
    360/138 or 2.61 mole of C7H6O3
    and therefore
    2.61 mol of C4H6O3
    2.61 = x/102
    x = 267
    (I did not carry all the decimal places)

  • runescape - ,

    I agree with you, mol masses 138 and 102
    C7H6O3 + C4H6O3 ---> C9H8O4 + HC2H3O2
    360/138 or 2.61 mole of C7H6O3
    and therefore
    2.61 mol of C4H6O3
    2.61 = x/102
    x = 267
    (I did not carry all the decimal places)

  • skyrim - ,

    Your work would not look so confusing if you used parentheses. For example,
    360 g C6H7O3 x (1 mol C6H7O3/138.118) x .....
    Your work looks ok, however, I ran this on my calculator and obtained 266.08 grams. (I also used 138.123 instead of 138.118 but I don't think that will make any significant difference). Are you keying this into a database? If so, and 266 doesn't work, I would try 2.66 x 10^2 since the problem was given in scientific notation.

  • Callofduty4 - ,

    360g C7H6O3 x 1 mol C7H6O3/138.118 g C7H6O3 x 1 mol C4H6O3/ 1 mol C7H6O3 x 102.088 g C4H6O3/1 mol C4H6O3 = 270g C4H6O3

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