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tywower

  • one year ago

Which of the following samples has the greatest mass? 1.4 mol Na 1.02 × 1024 atoms Na 23 g Na 6.02 × 1023 atoms Na

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  1. tywower
    • one year ago
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    @JoannaBlackwelder

  2. tywower
    • one year ago
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    :)

  3. JoannaBlackwelder
    • one year ago
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    Can you convert all of these to grams?

  4. tywower
    • one year ago
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    23 g Na im giving u free medals sorry

  5. tywower
    • one year ago
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    lol i figure out the answer after i post lol

  6. JoannaBlackwelder
    • one year ago
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    Haha, thanks, but I don't get 23 g to be the answer.

  7. tywower
    • one year ago
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    how so?

  8. JoannaBlackwelder
    • one year ago
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    Because I get one of the other options to be more mass when converted to grams.

  9. tywower
    • one year ago
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    ooh

  10. JoannaBlackwelder
    • one year ago
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    Do you know how to convert from moles to mass?

  11. tywower
    • one year ago
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    not really

  12. JoannaBlackwelder
    • one year ago
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    Ok, let me show you. We use the molar mass. Do you know what the molar mass of Na is?

  13. tywower
    • one year ago
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    22.9898

  14. JoannaBlackwelder
    • one year ago
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    Right. And that number is the number of grams in 1 mole of Na

  15. tywower
    • one year ago
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    yes

  16. JoannaBlackwelder
    • one year ago
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    We need to do a conversion that cancels out the unit of mol and goes to g |dw:1434382435002:dw|

  17. JoannaBlackwelder
    • one year ago
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    Then we fill in the numbers|dw:1434382521787:dw|

  18. JoannaBlackwelder
    • one year ago
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    And multiply the fractions.|dw:1434382560516:dw|

  19. JoannaBlackwelder
    • one year ago
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    Make sense?

  20. tywower
    • one year ago
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    yes

  21. JoannaBlackwelder
    • one year ago
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    Cool, so is that more than 23?

  22. tywower
    • one year ago
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    haha yes..

  23. tywower
    • one year ago
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    lol

  24. JoannaBlackwelder
    • one year ago
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    :-) So that is the highest so far. But we need to check the other two options too.

  25. tywower
    • one year ago
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    ok c:

  26. JoannaBlackwelder
    • one year ago
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    The amounts given in atoms, we have to do two steps. First converting to moles, then to grams.

  27. JoannaBlackwelder
    • one year ago
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    Do you know how many atoms are in 1 mol?

  28. tywower
    • one year ago
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    6.02 x 10^23

  29. JoannaBlackwelder
    • one year ago
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    Great! So can you use a similar conversion to convert to moles?

  30. tywower
    • one year ago
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    avogadro's number

  31. tywower
    • one year ago
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    yes

  32. JoannaBlackwelder
    • one year ago
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    Cool. how many moles do you get for B?

  33. tywower
    • one year ago
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    idk

  34. JoannaBlackwelder
    • one year ago
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    Let me set it up for you.|dw:1434383025321:dw|

  35. JoannaBlackwelder
    • one year ago
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    Where do you think the numbers go?

  36. tywower
    • one year ago
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    1 mole

  37. JoannaBlackwelder
    • one year ago
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    Right. :-) And?

  38. tywower
    • one year ago
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    6.02 x 10^23 atoms

  39. JoannaBlackwelder
    • one year ago
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    Yep, great! So, can you find the number of moles now?

  40. tywower
    • one year ago
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    yes

  41. JoannaBlackwelder
    • one year ago
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    :D

  42. JoannaBlackwelder
    • one year ago
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    What do you get?

  43. tywower
    • one year ago
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    39

  44. JoannaBlackwelder
    • one year ago
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    Did you go straight to grams? :-)

  45. tywower
    • one year ago
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    yes

  46. JoannaBlackwelder
    • one year ago
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    Great!

  47. JoannaBlackwelder
    • one year ago
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    So, can you find the grams for D?

  48. tywower
    • one year ago
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    23g Na

  49. JoannaBlackwelder
    • one year ago
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    :-) So, which one has the most mass?

  50. tywower
    • one year ago
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    B :)

  51. tywower
    • one year ago
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    right

  52. JoannaBlackwelder
    • one year ago
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    Yep!

  53. tywower
    • one year ago
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    An atom is determined to contain 17 protons, 18 electrons, and 18 neutrons. What are the mass number and charge of this atom or ion? mass number: 36, charge: -1 mass number: 35, charge: +1 mass number: 35, charge: -1 mass number: 36, charge: neutral

  54. tywower
    • one year ago
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    this one is confusing me

  55. JoannaBlackwelder
    • one year ago
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    Ok, what does the mass number mean?

  56. tywower
    • one year ago
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    the total number of protons and neutrons

  57. JoannaBlackwelder
    • one year ago
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    Good, so what do you get for the mass number?

  58. tywower
    • one year ago
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    35 so that eliminates a and d

  59. JoannaBlackwelder
    • one year ago
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    Good. And do you have any ideas on how to find the charge?

  60. tywower
    • one year ago
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    no

  61. JoannaBlackwelder
    • one year ago
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    Protons have a +1 charge and electrons have -1 charge.

  62. JoannaBlackwelder
    • one year ago
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    So, since we have one more electrons, that gives us a -1 overall charge.

  63. tywower
    • one year ago
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    ooh ok thanks

  64. JoannaBlackwelder
    • one year ago
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    You're welcome :-)

  65. tywower
    • one year ago
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    What types of questions can be answered through science and what questions are beyond the boundaries of science? Be specific and give examples to support your answer.

  66. JoannaBlackwelder
    • one year ago
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    What do you think?

  67. tywower
    • one year ago
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    i just tagged u

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