Wednesday, August 31, 2011

Chem Blog 3

Naturally occurring boron is 80.20% boron 11(atomic mass 11.01 daltons) and 19.80% of some other isotope. What must the mass of the other isotope be in order to have an average atomic mass of 10.81 daltons?
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28 comments:

  1. ArteenAugust 31, 2011 at 11:37 PM

    80.20% x 11.01amu = 8.83
    19.80% x X mass = .1980X

    8.83 + .1980X = 10.81
    .1980X = 1.98
    X Mass = 10 daltons

    ReplyDelete
  2. Garo KSeptember 1, 2011 at 7:51 PM

    * = multiply
    80.20% = .8020
    19.80% = .1980
    .8020 * 11.01 = 8.830
    .1980 * x = .1980x
    8.830 + .1980x = 10.81
    .1980x = 10.81 - 8.830
    .1980x = 1.98
    x = 1.98 / .1980
    x = mass = 10

    ReplyDelete
  3. Garo KSeptember 1, 2011 at 7:52 PM

    10 daltons*

    ReplyDelete
  4. ArthurSeptember 1, 2011 at 7:55 PM

    80.20% x 11.01 = 8.83
    19.80% x Xmass = .198X


    8.83 + .198x = 9.028
    .198x = 1.98
    X mass = 10 daltons

    ReplyDelete
  5. Ani KechichianSeptember 1, 2011 at 8:15 PM

    Baron 11
    80.20% ; 11.01amu
    multiply these = 8.83

    ?Baron
    X equals mass
    19.80% x X = 1980X

    10.81amu= 1980X + 8.83
    subtract 8.83 from both sides
    1.98= 1980X
    divide
    0.1= X
    move decimal 2 places to the right
    =10amu

    ReplyDelete
  6. Andy DanayanSeptember 1, 2011 at 10:43 PM

    80.20% x 11.01 = 8.83
    19.80% x X = .1980X

    8.83 + .1980X = 10.81
    .1980X = 1.98

    Mass = 10

    ReplyDelete
  7. Mr. PSeptember 2, 2011 at 2:19 AM

    Andy, don't forget your units!!!!

    ReplyDelete
  8. AnonymousSeptember 2, 2011 at 5:48 PM

    80.20% x 11.01 = 8.83
    19.80% x Xmass = .198X


    8.83 + .198x = 9.028
    .198x = 1.98
    X mass = 10 daltons

    ReplyDelete
  9. AmandaSirkedzhyanSeptember 2, 2011 at 6:36 PM

    This comment has been removed by the author.

    ReplyDelete
  10. AnonymousSeptember 2, 2011 at 6:42 PM

    80.20% x 11.01= 8.83
    19.80 x X= 19.80X
    19.80X + 8.83= 10.81amu
    subtract 8.83 from both sides
    1.93=.198X
    X=10 daltons

    ReplyDelete
  11. AmandaSirkedzhyanSeptember 2, 2011 at 6:42 PM

    80.29% multiplied by 11.01 will give you 8.83
    19.80% multiplied by X will end up as .198X
    Add your two results together, 8.83 + .198X, and you will end up with 9.028.

    .198X = 1.98

    X must equal 10 daltons.

    ReplyDelete
  12. lara kSeptember 2, 2011 at 9:25 PM

    80.20% x 11.01= 8.83
    19.80 x (X)= 19.80X
    19.80X + 8.83= 10.81 amu
    1.93= .198X
    X= 10 daltons

    ReplyDelete
  13. AregSeptember 2, 2011 at 11:01 PM

    80.20% x 11.01 = 8.83
    19.80% x (n) mass = .1980X
    8.83 + .1980(n) = 10.81
    .1980X = 1.98
    (N) Mass = 10 dal

    ReplyDelete
  14. AnonymousSeptember 3, 2011 at 9:34 AM

    80.20% x 11.01amu= 8.83
    19.80 x mass(X)= 19.80X
    19.80X + 8.83= 10.81 amu
    1.93= .198X
    X= 10 daltons

    ReplyDelete
  15. Lynna OhanianSeptember 3, 2011 at 12:10 PM

    n= atomic mass of second isotope
    80.20%x11.01=8.83
    19.80%x n=.1980n
    8.83+.1980n=10.81 daltons
    .1980n=1.98
    n=10 daltons

    ReplyDelete
  16. AnonymousSeptember 3, 2011 at 6:51 PM

    80.20% x 11.01amu =8.83
    19.80x X mass= 19.80X
    19.80X + 8.83= 10.81amu
    1.93=.198X
    X mass= 10 daltons

    -Anna Petrossian

    ReplyDelete
  17. AnonymousSeptember 4, 2011 at 12:46 PM

    80.20% * 11.01 = 8.83
    19.80% * x = .198x

    8.83 + .198x = 9.028
    .198x = 1.98
    x = 10 daltons

    ReplyDelete
  18. AnonymousSeptember 4, 2011 at 2:40 PM

    Natalie Bedrosian

    80.20% *11.01=8.83
    19.80%*x=.1980x
    8.83+.198x=10.81
    .1980x=1.98

    x=10 daltons

    ReplyDelete
  19. Natalie.KSeptember 4, 2011 at 4:58 PM

    80.20 * 11.01 = 8.83
    19.80 * x = 19.80X
    19.80x + 8.83 = 10.81 amu
    1.93 = 0.198x
    x = 10 daltons

    ReplyDelete
  20. pauline baktiSeptember 4, 2011 at 5:45 PM

    80.20% *11.01=8.83
    19.80%*x=.1980x
    8.83+.198x=10.81
    .1980x=1.98

    x=10 daltons

    ReplyDelete
  21. AnonymousSeptember 4, 2011 at 8:29 PM

    80.20(11.01)= 8.83
    19.80(X)= .1980x
    8.83 + .1980X = 10.81
    .1980X = 1.98
    mass= 10 daltons

    ReplyDelete
  22. GasigKSeptember 4, 2011 at 10:50 PM

    80.20 x 11.01amu = 8.83
    19.80 x X mass = .1980X
    8.83 + .1980X = 10.81
    .1980X = 1.98
    (x)mass =10 daltons

    ReplyDelete
  23. AnonymousSeptember 5, 2011 at 11:06 AM

    (80.20%)(11.01) = 8.83
    (19.80%)x = 0.198x

    8.83 + 0.198x = 10.81
    0.198x = 1.98

    x = 10 Daltons

    ReplyDelete
  24. garySeptember 5, 2011 at 1:01 PM

    80.20% x 11.01 = 8.83
    19.80% x (n) mass = .1980X
    8.83 + .1980(n) = 10.81
    .1980X = 1.98
    (N) Mass = 10 dal

    ReplyDelete
  25. lara kSeptember 5, 2011 at 1:13 PM

    SEVANA NOURIAN
    80.20% x 11.01amu = 8.83
    19.80% x mass(x) = .1980X
    8.83 + .1980X = 10.81
    .1980X = 1.98
    X Mass = 10 daltons

    ReplyDelete
  26. ShawntSeptember 5, 2011 at 1:42 PM

    80.20% of 11.01 daltons = 8.830 daltons (.8020 multiplied by 11.01)
    19.80% of x daltons = .1980x (.1980 multiplied by x)
    8.830 + .1980x = 10.81
    (subtract 8.830 from both sides)
    .1980x = 1.980
    (divide .1980 on both sides)
    x = 10.00 daltons

    ReplyDelete
  27. AnonymousSeptember 5, 2011 at 4:42 PM

    80.20% of 11.01 daltonss = 8.830 daltons ( multiply .8020 by 11.01)
    19.80% of x daltons = .1980x ( multiply .1980 by x)
    8.830 + .1980x = 10.81
    (subtract 8.830 from both sides)
    .1980x = 1.980
    (divide .1980 to both sides)

    then you will get an answer of..
    x = 10.00 daltons

    ReplyDelete
  28. Farah KandahSeptember 6, 2011 at 7:25 AM

    11.01(.8020%) = 8.830 daltons
    x(.1980%) = .1908x
    8.830 = .1980x = 10.81
    1980x = 1.980
    x=10.00 daltons

    ReplyDelete

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