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Self Test 1 Answers

Posted: Mon Jul 03, 2017 10:01 pm
by Ben Rolnik 1D
Hey guys!

Here are my answers for Self Test 1 -- What do you get?

1a. 24.0 g NaOH
1b. 81.3 mL

2a. 2AL + 6HCL --> 2AlCl3 + 3H2
2b. 9.51g AlCl3

3a. Dx >= 3.2 E -32
3b. 1.3 E -31 m

4. 3.61 E -19 J

5. CH4O

6. 2.98 J

7. 2CH3OH + 3O2 --> 2CO2 + 4H20

8. 1.86 E -6 m

9. C5H12O5

10. (drew a sine wave graph)
Amplitude = height of the waves = the intensity of the wave and/or the number of photons
Frequency = peak to peak distance = how many cycles pass in 1 second
Wavelength = distance between origin and 1 full cycle = the length of the wave's oscillations .

Re: Self Test 1 Answers

Posted: Tue Jul 04, 2017 5:23 pm
by Davalanya 1F
Could you explain how you set up 1B? I think I'm overthinking the entire thing. Thanks!

Re: Self Test 1 Answers

Posted: Tue Jul 04, 2017 6:24 pm
by Nahal 1F
Davalanya 1F wrote:Could you explain how you set up 1B? I think I'm overthinking the entire thing. Thanks!



You just multiply 250mL by .650 M and divide that by 2.00M. The M's will cancel out and leave you with about 81.3mL

Re: Self Test 1 Answers

Posted: Tue Jul 04, 2017 8:12 pm
by Davalanya 1F
5. is C3HO4

I checked with an old post from Lavelle.
viewtopic.php?t=2309

Re: Self Test 1 Answers

Posted: Wed Jul 05, 2017 11:31 pm
by Paul Wong1B
Ben's answer for number 5 is correct. Dr. Lavelle used C3HO4 as an example in the post when he divided the respective number of moles by the lowest value of moles.

Re: Self Test 1 Answers

Posted: Wed Jul 05, 2017 11:37 pm
by Chels Zh 1D
Hey guys, how did you get no.5, I got an extremely small number, I think I might have got some steps wrong.

Re: Self Test 1 Answers

Posted: Thu Jul 06, 2017 12:44 am
by Nahal 1F
Chels Zh wrote:Hey guys, how did you get no.5, I got an extremely small number, I think I might have got some steps wrong.


This is what I did. Not sure if it's right though

Re: Self Test 1 Answers

Posted: Thu Jul 06, 2017 1:03 am
by Sarahi Cota-Felix 1C
Yes, your work is correct up to your mol ratio at the end. I do not know where .2 C and .2 O come from. Your ratio should be C: 1 H: 4 O:1 giving you the final answer of CH4O.

Re: Self Test 1 Answers

Posted: Tue Jul 11, 2017 4:24 pm
by lnlyzelda_3J
Why is it that the produced grams for CO2 only apply to carbon? and respectively the same for H2O and Hydrogen?