Science & Mathematics - 21 October 2006

2006-10-21 08:12:14 · 9 answers · asked by reba 2 in Mathematics

1.177×10-4 mol of an unidentified gaseous substance effuses through a tiny hole in 77.2 s.
Under identical conditions, 1.638×10-4 mol of argon gas takes 82.3 s to effuse.

What is the molar mass of the unidentified substance (in g/mol)?

___________ g/mol

The percentage C by mass in the above unidentified substance is 53.0%. It may also contain H and/or O, but no other element.
What is the molecular formula of the substance?
(In typing this formula use the convention of C first, H second and O last. For example, C6H8O2 would be C6H8O2.)

Under identical conditions, how many moles of allene (C3H4) gas would effuse in 82.1 s?
________ mol

2006-10-21 08:10:52 · 1 answers · asked by Magnitudex 2 in Chemistry

The media never talks about it but there were 3 trade centers that collapsed on 911 (1,2, and 7). If you go to google video and type in WTC7 collapse you could see it. I'm really interested in this and I'm not a conspiracy nut but all I know is that no steel frame building in the history of man has ever collapsed from fire except for that day.

2006-10-21 08:08:31 · 13 answers · asked by Peter F 1 in Engineering

if u don't get wat i'm asking this is an example. Gold got its name from the Indo-European root word yellow.

2006-10-21 08:07:32 · 4 answers · asked by hello 1 in Chemistry

2006-10-21 08:03:57 · 3 answers · asked by Hubby 1 in Other - Science

2006-10-21 08:00:46 · 6 answers · asked by Anonymous in Mathematics

i just started learn alchemy but i dont know what to do so i was wondering if someone can push me in the right direction?

2006-10-21 07:59:45 · 4 answers · asked by jeff 1 in Other - Science

what if they stick to the clothes in my closet , then i wear the clothes, then what if the maggots go inside of me and eat me alive ? help!?!?what is the best way to get rid of them ???(i am really freaked out)

2006-10-21 07:53:50 · 7 answers · asked by Anonymous in Biology

2006-10-21 07:52:12 · 6 answers · asked by John 1 in Medicine

Any help would be awesome...

2006-10-21 07:46:47 · 6 answers · asked by azudai45 1 in Astronomy & Space

I heard somewhere that it doesn't actually hurt your head that it hurts your mouth but the pain is registered somewhere else, true? if so please elaborate!!

2006-10-21 07:46:45 · 15 answers · asked by I'm better than you 4 in Other - Science

As strange as this sounds...It's extra credit for me if I find out. Anyone know?

2006-10-21 07:46:28 · 7 answers · asked by Terribou 2 in Zoology

A bathroom scale measures weight to nearest pounds(lbs).

a) Determine the presicion of the scale.



How would you get an answer? =(

2006-10-21 07:45:41 · 4 answers · asked by Anonymous in Mathematics

SAME AS BEFORE IF YOU ARE OFFENDED GO ANSWER A BORING QUESTION!!!!!!!!!!!!!

2006-10-21 07:45:31 · 16 answers · asked by ? 5 in Biology

1. You have set up an ordinary annuity that will pay you $650.00 a month for the next 25 years. You will earn interest at a rate of 5.5% compounded monthly. What amount did you invest to accomplish this goal?

2. If an annuity was set up for semi-annual payments at the end of each period in the amt of $1350, what would be the value of this annuity after 15 1/2 yrs with interest compounded semiannually at a rate of 4%?

3. A company requires the amount of $850,000 in twenty(20) years to retire a bond issue. Assume they earn 5% interest compounded quarterly. What amount would they have to pay quarterly to be able to retire this debt in 20 years?

2006-10-21 07:43:44 · 1 answers · asked by NONE N 1 in Mathematics

2006-10-21 07:43:30 · 11 answers · asked by nightmare_reality95 1 in Other - Science

2006-10-21 07:40:51 · 12 answers · asked by Anonymous in Mathematics

I really need help finding info on Magnetic Energy!
Here's what I need to know:

Definition of Magnetic Energy

Examples of how Magnetic Energy is used in everyday life

What units Magnetic Energy is measured in and

How to convert those units to joules

Please help if you know or can give me a helpful website
Thanks!!!!

2006-10-21 07:39:56 · 0 answers · asked by Anonymous in Chemistry

2006-10-21 07:38:02 · 1 answers · asked by Anonymous in Mathematics

2006-10-21 07:37:26 · 2 answers · asked by Gus 1 in Other - Science

2006-10-21 07:36:21 · 13 answers · asked by Anonymous in Mathematics

what is the formula for lithium hypochlorite?

2006-10-21 07:35:56 · 0 answers · asked by Anonymous in Chemistry

2006-10-21 07:35:52 · 6 answers · asked by Jamiul W 2 in Other - Science

And by how much??

Thanks for answering!

2006-10-21 07:32:01 · 13 answers · asked by Anonymous in Other - Science

i need good books,
i dont want scattered information about blueprints, i want to buy something that has it all so i can get the diploma.

please and thank you

2006-10-21 07:30:44 · 5 answers · asked by Anonymous in Geography

how many kilograms is 100 pounds?

2006-10-21 07:29:48 · 10 answers · asked by ♥Sasha♥ 2 in Mathematics

2006-10-21 07:28:04 · 3 answers · asked by I'm better than you 4 in Other - Science

IF YOU ARE OFFENDED GO AND ANSWER A BORING QUESTION!!!!!!!!!!!!!

2006-10-21 07:25:10 · 17 answers · asked by ? 5 in Biology

2006-10-21 07:20:49 · 10 answers · asked by $Sun King$ 7 in Biology

2006-10-21 07:19:52 · 14 answers · asked by mark 1 in Physics