Science & Mathematics - 29 October 2007

I can't figure this out for the life of me. HELP!!

Acetic acid, HC2H3O2, is the sour constituent of vinegar. In an experiment, 3.16 g of acetic acid was burned.

HC2H3O2(l) + 2 O2(g) 2 CO2(g) + 2 H2O(l)

If 45.9 kJ of heat evolved, what is change in H (enthalpy) per mole of acetic acid?

Thanks so much!

2007-10-29 07:52:24 · 1 answers · asked by 23chromosomes 4 in Chemistry

2007-10-29 07:40:36 · 2 answers · asked by Ben S 1 in Mathematics

Calculate the distance between points A and B on the surface of the earth
A: Latitude 25° 47’ 42” Longitude 80° 16’ 4”
B: Latitude 51° 27’ 36” Longitude 0° 26’ 46”

I know that if you’re clever enough, there are various ways to find the answer to this question. Preference for best answer will be given to answers with a mathematical approach that can be generalized.

You may take the radius of the earth as 4000 miles.

2007-10-29 07:36:30 · 4 answers · asked by Dr D 7 in Mathematics

okay this is like a math thinger and heres an example of how to do the equations....ie:(5+3)times(6+10)

so ANYwayss..heres the Q:Thomas worked 8h on each of these days :tuesday thursday and saturday
he worked 6h on both monday and wednesday he earns $8.55/h
The following week he worked 5h on both tuesday and thursday and 7h on saturday

A) write an expression for thomas' earnings for the first week

2007-10-29 07:34:35 · 7 answers · asked by lissemarie 1 in Mathematics

i need to write 4 word problems one for adding subtracting dividing and multiplying what are some with the answers and stuff. make sure u rite the answers

2007-10-29 07:33:42 · 5 answers · asked by Olivia B 1 in Mathematics

Next semester I'm going to take it, but I would like to be familiar with it to get the best possible grade.

2007-10-29 07:33:23 · 2 answers · asked by Allen 3 in Mathematics

I am really interested to know how long the earth will last for because of global warming etc, plz tell me any genuine information that you have because i am just so interested in this stuff!!? Thanks.

2007-10-29 07:30:40 · 6 answers · asked by jords-will-solve-it 3 in Astronomy & Space

"Find the volume of the largest right circular

cone that can be inscribed in a sphere of radius 3."

This is my Question!!

Please help me!!

2007-10-29 07:23:30 · 2 answers · asked by michaelfnck 3 in Mathematics

20% 0f 42

2007-10-29 07:21:45 · 20 answers · asked by shaz l 1 in Mathematics

2007-10-29 07:20:12 · 1 answers · asked by ukbg 1 in Physics

2007-10-29 07:18:37 · 12 answers · asked by Jo 1 in Other - Science

2007-10-29 07:16:56 · 51 answers · asked by A.K.22 1 in Mathematics

2007-10-29 07:16:54 · 1 answers · asked by ukbg 1 in Physics

and does it have an affect on the environment?

2007-10-29 07:14:19 · 4 answers · asked by Doesntstayinvegas.com 3 in Weather

What are the exact mechanisms used to transplant the Bt Toxin from the bacteria (bt) to corn?

2007-10-29 07:12:55 · 1 answers · asked by Sam B 2 in Biology

2007-10-29 07:12:04 · 11 answers · asked by Chellie M 1 in Physics

A vial was tested from a cell bank and was found to be contaminated with mycoplasma.

How can cell culture be contaminated with mycoplasma?

2007-10-29 07:11:54 · 2 answers · asked by LawGirl 2012 2 in Biology

for b

A = h(B + b)/2

2007-10-29 07:08:56 · 3 answers · asked by Lu Y 1 in Mathematics

how can you dentermine the strengths of relationships if you have
r, r-squared, linear regression, and other values for a set of data. any information would help.

2007-10-29 07:05:13 · 2 answers · asked by Amanda 1 in Mathematics

is it a reflection of the sea, or light reflectiong through nitrogen particles... or any others...

2007-10-29 06:58:46 · 45 answers · asked by Anonymous in Physics

I know that most house plants emit oxygen due to photosynthesis, but does a plant emit enough oxygen to actually make a noticable difference in a room? I only have a two foot tall plant, and even though it has very large leaves, it's still relativly small. My room is about 300 square feet so I'm sure it doesn't make a difference, but maybe if I got more plants or something it would. Any plant experts out there?

2007-10-29 06:58:19 · 4 answers · asked by Anonymous in Botany

If an even function f(x) has a local maximum

value at x = c, can anything be said about the

value of f at x = −c? Give reasons for your

answer.


This is my question!!

Please help me!!

Thanks!!!

2007-10-29 06:57:49 · 8 answers · asked by michaelfnck 3 in Mathematics

this question has puzzled me for ages

2007-10-29 06:57:32 · 22 answers · asked by Anonymous in Physics

do you believe in this>?

2007-10-29 06:56:51 · 5 answers · asked by Anonymous in Astronomy & Space

2007-10-29 06:56:46 · 4 answers · asked by ? 1 in Astronomy & Space

ALGEBRA

2007-10-29 06:50:09 · 6 answers · asked by spitzdaniel 1 in Mathematics

To me they both mean the same thing. The ability to see a possible future.

2007-10-29 06:44:46 · 5 answers · asked by jpmarin5 2 in Parapsychology

2007-10-29 06:41:08 · 2 answers · asked by Rebecca xxx 2 in Physics

A long jumper leaves the ground at an angle of 20.0 degrees to the horizontal and at a speed of 11.0m/s.

(a.) How long does it take for him to reach maximum height?

(b.) What is the maximum height?







I'm stuck on how to do these. Thanks for the help!!!!! God Bless!

2007-10-29 06:39:59 · 1 answers · asked by Anonymous in Physics

2007-10-29 06:35:02 · 4 answers · asked by julie r 1 in Medicine