Tuesday, August 23, 2011

Chemistry Blog 2

Element Z was recently discovered and has three different isotopes. Isotope 1 has a mass of 45 daltons and is found in nature 33% of the time. Isotope 2 has a mass of 46 daltons and is found in nature 57% of the time, and Isotope 3 is 48 daltons and is found in nature 10% of the time. What is the average atomic mass of element Z?
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21 comments:

  1. AlecBroutianAugust 24, 2011 at 5:43 PM

    Mr P. doesnt the element Z have 2 isotpes?

    ReplyDelete
  2. AnonymousAugust 24, 2011 at 5:46 PM

    is it 45.41 daltons?

    ReplyDelete
  3. ShawntAugust 25, 2011 at 8:02 PM

    15.29 daltons

    ReplyDelete
  4. Farah KandahAugust 25, 2011 at 8:06 PM

    46.3 Daltons

    ReplyDelete
  5. suroAugust 25, 2011 at 10:19 PM

    46.3

    ReplyDelete
  6. Lynna OhanianAugust 26, 2011 at 11:43 PM

    45x33%=14.85
    46x57%=26.22
    48x10%=4.8

    14.85+26.22+4.8=

    45.87 daltons.

    ReplyDelete
  7. ArteenAugust 27, 2011 at 3:28 PM

    The average atomic mass of an element is the weighted average of the atomic masses of its naturally occurring isotopes. It depends on the mass and the relative abundance of the different isotopes.

    Isotope #1- 33% x 45amu = 14.85amu
    Isotope #2- 57% x 46amu = 26.22amu
    Isotope #3- 10% x 48amu = 4.8amu

    14.85+26.22+4.8 = 45.87

    Average atomic mass =45.87 daltons

    ReplyDelete
  8. Andy DanayanAugust 27, 2011 at 4:25 PM

    48 x 10% = 4.8
    46 x 57% = 26.22
    45 x 33% = 14.85

    4.8 + 26.22 + 14.85 = 45.87
    Atomic Mass = 45.87 Daltons

    ReplyDelete
  9. AnonymousAugust 27, 2011 at 7:36 PM

    Isotope 1-33% x 45=14.85
    Isotope 2-57% x 46=26.22
    Isotope 3-10% x 48=4.8

    14.85+ 26.22+ 4.8= 45.87 Daltons

    ReplyDelete
  10. AnonymousAugust 28, 2011 at 10:16 AM

    45(.33)=14.85 daltons
    46(.57)= 26.22 daltons
    48(.1)= 4.8 daltons

    14.85+26.22+4.8= 45.87 daltons

    ReplyDelete
  11. AregAugust 28, 2011 at 11:13 AM

    33% of 45 = 14.85 Dal (isotope 1)
    57% of 46 =26.22 Dal (isotope 2)
    10% of 48 = 4.8 Dal (isotope 3)

    add them all up and you get 45.87 Dal.

    ReplyDelete
  12. lara kAugust 28, 2011 at 11:52 AM

    .33 x 45= 14.85 dal
    .10 x 48= 4.8 dal
    .57 x 46= 26.22 dal
    14.8 + 4.8 + 26.22= 45.87
    Atomic mass= 45.87 dal

    ReplyDelete
  13. AnonymousAugust 28, 2011 at 12:19 PM

    Natalie B

    45 * 0.33= 14.85 daltons
    46 * 0.57= 26.22 daltons
    48 * 0.10= 4.8 daltons

    14.8+26.22+4.8= 45.87 daltons

    ReplyDelete
  14. Natalie.KAugust 28, 2011 at 6:02 PM

    0.33 x 45 = 14.85 dal
    0.57 x 46 = 26.22 dal
    0.1 x 48 = 4.8 dal
    14.85 + 26.22 + 4.8 = 45.87 daltons

    ReplyDelete
  15. AnonymousAugust 28, 2011 at 7:06 PM

    48 x 10% = 4.8
    46 x 57% = 26.22
    45 x 33% = 14.85

    4.8 + 26.22 + 14.85 = 45.87
    Atomic Mass = 45.87 Daltons

    ReplyDelete
  16. UnknownAugust 28, 2011 at 9:11 PM

    45x .33= 14.85 daltons
    46x .57= 26.22 daltons
    48x .10= 4.8 daltons
    if u add them together you get a total of 45.87 daltons

    ReplyDelete
  17. GasigKAugust 28, 2011 at 9:17 PM

    33% x 45=14.85(isotope 1)
    57% x 46=26.22(isotope 2)
    10% x 48=4.8(isotope 3)

    mass=14.85+ 26.22+ 4.8= 45.87 Daltons

    ReplyDelete
  18. garyAugust 28, 2011 at 9:20 PM

    45.2

    ReplyDelete
  19. AnonymousAugust 28, 2011 at 9:49 PM

    45 * .33= 14.85 daltons
    46 * .57= 26.22 daltons
    48 * .10= 4.8 daltons

    26.22 + 14.85 + 4.8 = 45.87 daltons

    ReplyDelete
  20. Garo KAugust 29, 2011 at 11:23 AM

    45(.33)=14.85 daltons
    46(.57)= 26.22 daltons
    48(.1)= 4.8 daltons

    14.85+26.22+4.8= 45.87 daltons

    ReplyDelete
  21. pauline baktiAugust 29, 2011 at 11:40 AM

    45 • .33= 15
    46• .57= 26.22
    48• .10 = 4.8

    ReplyDelete

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