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anonymous

  • one year ago

PLEASE HELP!!! A 19.4 gram sample of gas is found to have a volume of 1.3 liters at 282 K and 1.2 atm. What is the molar mass of this gas? Show all of the work used to solve this problem.

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  1. arindameducationusc
    • one year ago
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    Use PV=nRT

  2. arindameducationusc
    • one year ago
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    here T=282 V=1.82 P=1.2 R=0.0821 and n=m/M we need M, so put m=19.4 to get M

  3. arindameducationusc
    • one year ago
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    It should look1.2*1.82=(19.4/M)*0.0821*282

  4. arindameducationusc
    • one year ago
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    @fenispart Got it?

  5. anonymous
    • one year ago
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    @arindameducationusc Yeah I understand now. I got 289.55

  6. anonymous
    • one year ago
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    @arindameducationusc I also need help with one last one: A solution is made by dissolving 23.5 grams of glucose (C6H12O6) in .245 kilograms of water. If the molal freezing point constant for water (Kf) is -1.86 °C/m, what is the resulting Δtf of the solution? Show all the steps taken to solve this problem.

  7. arindameducationusc
    • one year ago
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    Didn't I give you the formula last time? Okay I will show again...

  8. arindameducationusc
    • one year ago
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    \[\Delta{T}=K _{f}* W _{b}*1000/ Mw _{b}*W _{a}\] Here Mwb= 180 because C6H12O6 6*12+12*1+6*1=180

  9. arindameducationusc
    • one year ago
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    convert .245 kg to gram....

  10. anonymous
    • one year ago
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    25.4g

  11. arindameducationusc
    • one year ago
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    you get 245 gram (This is Wa)

  12. arindameducationusc
    • one year ago
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    1kg=1000grams

  13. arindameducationusc
    • one year ago
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    and Wb is 19.4, and the rest is given in question... Got it?

  14. arindameducationusc
    • one year ago
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    @fenispart Can you solve now?

  15. anonymous
    • one year ago
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    Is 19.4 always Wb?

  16. arindameducationusc
    • one year ago
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    No not always, but for this question 19.4 is Wb

  17. anonymous
    • one year ago
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    How do you find Wb?

  18. arindameducationusc
    • one year ago
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    hmmmm....Its given in the question.... READ THE QUESTION

  19. anonymous
    • one year ago
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    Wait are we talking about the first question or the second one?

  20. arindameducationusc
    • one year ago
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    oops... my bad...... its second question and Wb is 23.5.

  21. arindameducationusc
    • one year ago
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    sorry about that

  22. arindameducationusc
    • one year ago
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    23.5 is given... I guess now you got it. Both questions are about gas so.... I made a mistake........

  23. arindameducationusc
    • one year ago
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    Can you do now? @fenispart

  24. anonymous
    • one year ago
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    How do I find Kf? @arindameducationusc

  25. arindameducationusc
    • one year ago
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    Kf is given -1.86

  26. anonymous
    • one year ago
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    I got -0.991 @arindameducationusc

  27. arindameducationusc
    • one year ago
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    Total answer?

  28. anonymous
    • one year ago
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    Yes

  29. anonymous
    • one year ago
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    @arindameducationusc

  30. arindameducationusc
    • one year ago
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    i m here

  31. arindameducationusc
    • one year ago
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    Yes your answer is correct....

  32. arindameducationusc
    • one year ago
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    I just checked it... Good job! Bravo!

  33. anonymous
    • one year ago
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    Thank you so much!

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