2009 DAT Questions, does anyone know how to solve these 3 questions. Thanks.

[m617911622]

I thought the answer was 3, the answer key said 2. Why ?

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[cas2022]

50. This is a standard colligative property calculation. Change in temperature= iKfm. i=1 because ethylene glycol does not dissociate, Kf=1.86, and m=molality=(moles solute)/(kg solvent)= 2/1. Multiply them all together and you get -3.75

89. You are correct in saying that the answer is 3. The test said naphthalene, but showed you a picture of anthracene (has one additional ring)

Can't help you with 99, got that wrong too There are a ton of mistakes on 2009 that a lot of people have mentioned on separate SDN posts as well!

 

[m617911622]

50. This is a standard colligative property calculation. Change in temperature= iKfm. i=1 because ethylene glycol does not dissociate, Kf=1.86, and m=molality=(moles solute)/(kg solvent)= 2/1. Multiply them all together and you get -3.75

89. You are correct in saying that the answer is 3. The test said naphthalene, but showed you a picture of anthracene (has one additional ring)

Can't help you with 99, got that wrong too There are a ton of mistakes on 2009 that a lot of people have mentioned on separate SDN posts as well!

Thankssss

 

[vvgp1216]

Hello, can you please explain why the answer to question 89 is 3? I'm not sure I'm understanding why. Thank you!

 

[iphone2020]

The exact question is in destroyer if u look u will see it


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