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iheartfood

  • 2 years ago

#1: At STP, how many molecules of nitrogen gas are in 22.4 L? A. 6.022 × 10^22 B. 6.022 × 10^23 C. 6.022 × 10^24 D. 6.022 × 10^25 **my answer: B is that right?? @aaronq :)

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  1. iheartfood
    • 2 years ago
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    #2: Molar mass is the molecular (formula) mass of any substance expressed in which of the following? A. moles B. grams C. kilograms D. liters **my answer: A is that right?

  2. aaronq
    • 2 years ago
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    molar mass is expressed in gram per mole

  3. aaronq
    • 2 years ago
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    1 is right though

  4. iheartfood
    • 2 years ago
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    #3: Which of the following temperatures and pressures are used as standards for gases? A. 0°C, 1 atm B. 25°C, 1 atm C. 10°C, 1 atm D. 5°C, 2 atm **my answer; A or is it B?? ;/ idk im a bit conflicted :/

  5. iheartfood
    • 2 years ago
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    okay so what is #2 then? ;/

  6. aaronq
    • 2 years ago
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    2 would be grams

  7. aaronq
    • 2 years ago
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    mass = unit of weight measurement

  8. iheartfood
    • 2 years ago
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    ohhh okay!! :) #4: Which of the following is NOT a measure of the amount of matter? A. mole B. molar mass C. molar volume D. STP **my answer; D is that right?

  9. aaronq
    • 2 years ago
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    STP, standard temperature and pressure ALWAYS 25 celsius and 1 atm (760 torr/mm Hg)

  10. aaronq
    • 2 years ago
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    4 is right

  11. iheartfood
    • 2 years ago
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    #5: Which of the following is equal to the number of particles in 18 grams of carbon-12? A. 1.5 : 1 mole ratio B. 1.5 : 1 molar mass c. 1.5 moles D. 1 : 1.5 molar volume *my answer: B is that right? :/

  12. iheartfood
    • 2 years ago
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    wait so #3 is B. 25°C, 1 atm ??

  13. aaronq
    • 2 years ago
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    yeah 3 is B. 5 is oddly worded, the only that makes sense is 1.5 moles because n=18g/12g/mol=1.5 moles

  14. iheartfood
    • 2 years ago
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    #6: Which of the following substances has a molar mass of 208 g? A. P2O5 B. BaCl2 C. AlCl3 D. MgCl2 **my answer; B is that right? :)

  15. iheartfood
    • 2 years ago
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    okay!! so #5 is what then?? :/

  16. aaronq
    • 2 years ago
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    5 would be 1.5 moles, C.

  17. aaronq
    • 2 years ago
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    6 is right (Y)

  18. iheartfood
    • 2 years ago
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    aweosme!! :) thx! #7: Who discovered the principle that equal volumes of gases at the same temperature and pressure contain the same number of particles? A. John Dalton B. Amedeo Avogadro C. Ernest Rutherford D. Jacques Charles *my answer: B is that right? :)

  19. aaronq
    • 2 years ago
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    yep! my main man avogadro

  20. aaronq
    • 2 years ago
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  21. iheartfood
    • 2 years ago
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    #8: What is the volume of 1.5 moles of gas at STP? A. 9.02 L B. 20.0 L C. 33.6 L D. 22.4 L **my answer; C is that right??

  22. iheartfood
    • 2 years ago
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    LOL thats hilarious!!! :P

  23. iheartfood
    • 2 years ago
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    #9: You do an experiment in which you need 0.25 moles of tyrosine (C9H11NO3). How many grams must you weigh out? A. 45.3 g B. 90.5 g C. 181 g d. 272 g **my answer; A is that right? :)

  24. aaronq
    • 2 years ago
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    8 is good

  25. aaronq
    • 2 years ago
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    9 is also correct

  26. aaronq
    • 2 years ago
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  27. aaronq
    • 2 years ago
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    this one you might not get

  28. iheartfood
    • 2 years ago
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    #10: For an experiment, you need to dissolve 0.10 moles of NaCl in 1 liter of water. How much NaCl must you weigh out? A. 8.2 g B. 5.8 g C. 3.2 g D. 0.14 g **my answer: B to is it A?? :/

  29. iheartfood
    • 2 years ago
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    lol yeah i get it, cuz h202 is hydrogen peroxide, which is poisonous and would kill u haha my friend told me this b4 lol

  30. aaronq
    • 2 years ago
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    hahaha wow, good stuff (Y)

  31. iheartfood
    • 2 years ago
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    #11: A doctor prescribes 1,500 mg of glucosamine (C6H13NO5) per day for a person with osteoarthritis. How many moles of glucosamine does the patient take each day? A. 8.38 B. 8.38 × 10^-3 C. 0.12 D. 1.79 × 10^-3 **my answer: B is that right? haha and yeah ikr?? :) so is #10 right?? is it B? or is it A? :/

  32. aaronq
    • 2 years ago
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    10 is right, B

  33. iheartfood
    • 2 years ago
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    #12: In a chemical reaction, you collect 500 mL of hydrogen gas at STP. How many moles of hydrogen gas did you collect? A. 22 B. 0.22 C. 0.02 D. 0.004 **my answer; C is that right?? and yayy :)

  34. iheartfood
    • 2 years ago
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    #13: How many atoms are in 1.0 moles of xenon gas at STP? A. 2.2 × 10^23 B. 3.0 × 10^22 C. 3.0 × 10^24 D. 6.0 × 10^23 **idk this one :( do u get it?

  35. aaronq
    • 2 years ago
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    11 is good!

  36. iheartfood
    • 2 years ago
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    yay :)

  37. aaronq
    • 2 years ago
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    12 is good

  38. iheartfood
    • 2 years ago
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    #14: A chemical reaction produces oxygen gas. You collect 6.02 × 10^23 oxygen gas molecules at STP. What volume of oxygen gas did you collect? A. 2.8 L B. 5.6 L C. 11.2 L D. 22.4 L **my answer; D is that irhgt?? :)

  39. aaronq
    • 2 years ago
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    for 13, you have to know that Xe(g) is not diatomic, so you know 1 mole = 6.022x10^23 atoms/molecules

  40. aaronq
    • 2 years ago
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    14 is good also!

  41. iheartfood
    • 2 years ago
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    annnndd last one!!! (which unfortunately i do not understand :(.... ) #15: A chemical reaction produces 5.6 L of nitrous oxide gas (N2O) at STP. What is the mass of the gas produced? A. 0.25 g B. 5.6 g C. 11 g D. 44 g ***idk :(

  42. aaronq
    • 2 years ago
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  43. iheartfood
    • 2 years ago
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    so 13 would be D. 6.0 × 10^23 ??

  44. iheartfood
    • 2 years ago
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    lol that was a good one :P and that kitty is so cute with the glasses and stuff!! =)

  45. aaronq
    • 2 years ago
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    yes 13 is D, noble gases are ALWAYS unimolecular. uni=1

  46. iheartfood
    • 2 years ago
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    awesome! :)what about 15 tho?? and i found a good one hahaha :P i like this one :)

  47. aaronq
    • 2 years ago
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    so for 15, find how many moles you produced, 1 mole of gas at STP = 22.414 L so moles = 5.6/22.414 then use that to find the grams with the molar mass of N2O moles= mass/molarmass mass = moles*molarmass

  48. aaronq
    • 2 years ago
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    HAHA I've never seen that one, i like it

  49. iheartfood
    • 2 years ago
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    so is #15 A. 0.25 g?? and i found a kinda continued one of one u posted above :) and hahaa yeahh i like that one :)

  50. iheartfood
    • 2 years ago
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    lol

  51. iheartfood
    • 2 years ago
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    and this one :P

  52. aaronq
    • 2 years ago
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    nope! 11 g

  53. aaronq
    • 2 years ago
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    "ALL THESE CHEM JOKES ARE BORON ME" LOL

  54. iheartfood
    • 2 years ago
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    and i liked this one too :P

  55. aaronq
    • 2 years ago
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  56. aaronq
    • 2 years ago
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    haha periodically

  57. iheartfood
    • 2 years ago
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    okay!! :) thanks!! :) and lol that ones good :) and heres another one.. but its with... the one and only!!! PAtrick... STar!!!!

  58. aaronq
    • 2 years ago
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    oh wait i added up the molar mass of N2O wrong i did NO2

  59. aaronq
    • 2 years ago
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    lol it's still 11 grams

  60. iheartfood
    • 2 years ago
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    okay!! haha thanks!! :D

  61. aaronq
    • 2 years ago
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    :) no prob haha i haven't watched spongebob in like i don't even know, forever.

  62. iheartfood
    • 2 years ago
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    haha yeah same, but i love patrick!! :) i mean he lives in a rock.. how do u even find a hollowed out rock?? :) spongebob is awesome!! :)the best cartoon ever!! :) lol thanks again!! :D

  63. aaronq
    • 2 years ago
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    it is so awesome, i liked the movie too! no problem at all!

  64. iheartfood
    • 2 years ago
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    yeah!! haha i watched it a while ago but all spongebob is good and funny :)

  65. aaronq
    • 2 years ago
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    agreed :) i'm gonna go, see ya !

  66. iheartfood
    • 2 years ago
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    byebye! :D

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