anonymous
  • anonymous
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.
Chemistry
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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arindameducationusc
  • arindameducationusc
Use PV=nRT
arindameducationusc
  • arindameducationusc
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
arindameducationusc
  • arindameducationusc
It should look1.2*1.82=(19.4/M)*0.0821*282

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arindameducationusc
  • arindameducationusc
@fenispart Got it?
anonymous
  • anonymous
@arindameducationusc Yeah I understand now. I got 289.55
anonymous
  • anonymous
@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.
arindameducationusc
  • arindameducationusc
Didn't I give you the formula last time? Okay I will show again...
arindameducationusc
  • arindameducationusc
\[\Delta{T}=K _{f}* W _{b}*1000/ Mw _{b}*W _{a}\] Here Mwb= 180 because C6H12O6 6*12+12*1+6*1=180
arindameducationusc
  • arindameducationusc
convert .245 kg to gram....
anonymous
  • anonymous
25.4g
arindameducationusc
  • arindameducationusc
you get 245 gram (This is Wa)
arindameducationusc
  • arindameducationusc
1kg=1000grams
arindameducationusc
  • arindameducationusc
and Wb is 19.4, and the rest is given in question... Got it?
arindameducationusc
  • arindameducationusc
@fenispart Can you solve now?
anonymous
  • anonymous
Is 19.4 always Wb?
arindameducationusc
  • arindameducationusc
No not always, but for this question 19.4 is Wb
anonymous
  • anonymous
How do you find Wb?
arindameducationusc
  • arindameducationusc
hmmmm....Its given in the question.... READ THE QUESTION
anonymous
  • anonymous
Wait are we talking about the first question or the second one?
arindameducationusc
  • arindameducationusc
oops... my bad...... its second question and Wb is 23.5.
arindameducationusc
  • arindameducationusc
sorry about that
arindameducationusc
  • arindameducationusc
23.5 is given... I guess now you got it. Both questions are about gas so.... I made a mistake........
arindameducationusc
  • arindameducationusc
Can you do now? @fenispart
anonymous
  • anonymous
How do I find Kf? @arindameducationusc
arindameducationusc
  • arindameducationusc
Kf is given -1.86
anonymous
  • anonymous
I got -0.991 @arindameducationusc
arindameducationusc
  • arindameducationusc
Total answer?
anonymous
  • anonymous
Yes
anonymous
  • anonymous
@arindameducationusc
arindameducationusc
  • arindameducationusc
i m here
arindameducationusc
  • arindameducationusc
Yes your answer is correct....
arindameducationusc
  • arindameducationusc
I just checked it... Good job! Bravo!
anonymous
  • anonymous
Thank you so much!

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