Science & Mathematics - 16 August 2007

A balloon filled with 2l of hydrogen gas contains 0.18 g of H2.

(a) How many mol of H2 are there in the balloon ?
(b) How many molecules does it contain ?
(c) How many atom does it contain ?

DATA NA = 6.023 x 1023 mol 1
Please help me:0(

2007-08-16 01:11:51 · 4 answers · asked by kkmdjs 2 in Chemistry

i mean,u need another diamond to cut another,so how did they cut the first one? Laser?

2007-08-16 01:11:34 · 5 answers · asked by Anonymous in Earth Sciences & Geology

2007-08-16 01:08:06 · 6 answers · asked by dandawow 1 in Mathematics

Geography homework: How does the spraying of pesticides or usage of fertilizers on a farm affect the environment. How does it cause water pollution?

2007-08-16 01:07:10 · 1 answers · asked by big_swords 2 in Geography

How many different words of four letters(they should not neccesarily be the part of speech) can be formed from the letters R E A C T I O N, satisfying the following conditions:
(1) the letter N must exist in each and every word
(2) the letter T is not admitted at the end of the word (so the words like REACIONT are not what asked for).

Thnx in anticipation.

2007-08-16 01:03:50 · 2 answers · asked by Anonymous in Mathematics

they say that if the asteroid in 2029 hits earth it will kill us but i have also seen and heard that the ateroid will just miss us and come back seven years later do you think this will happen?

2007-08-16 01:00:28 · 12 answers · asked by jess s a 1 in Astronomy & Space

this question is related to chemistry

2007-08-16 00:58:19 · 2 answers · asked by aftabsaad s 1 in Chemistry

well, if there is.. please suggest one.. if your asking the topic any would do...thanks...

2007-08-16 00:56:12 · 1 answers · asked by KairiCullen 1 in Mathematics

some people claim i'm an expert but it took me great pains to tell them i'm not. So i'm asking if i'm an expert or just a normal person?

2007-08-16 00:53:07 · 8 answers · asked by Abdulla S 1 in Medicine

2007-08-16 00:51:12 · 1 answers · asked by rajstar100 3 in Geography

240V AC charts or calculators only please.

2007-08-16 00:46:53 · 9 answers · asked by Anonymous in Engineering

If you look at the Job Centre you'll see we have indeed been invaded....whats your theories on Alien? especially with that Haiti Video, im pretty sure its fake but mweh!

2007-08-16 00:33:51 · 6 answers · asked by My Pitseleh 4 in Astronomy & Space

Examples:
Why aren't there people that can run very very fast?
Or with an eye at the back of their back?
Or a human race like elves, dwarves?
Or a human race that can smell or see extremely well?
Or people that see black & white?

Reference points:
1. No one can claim that having 6 fingers is weak against evolution.
2. All our differences are minor, like color, shape of body parts, minor differences in perception etc.

2007-08-16 00:29:04 · 14 answers · asked by Anonymous in Biology

helo..

i need some information on the theory of everything..

the chronological orders...

pls....

thx!

2007-08-16 00:25:09 · 2 answers · asked by ganda 1 in Botany

Ok so what i have to say is How did space get where it is now people will say it was a big bang but how did that big bang come from and so on and so on and probly people will say god but like ummmmm sure w/e >_< and another thing how can space be so big u can go so far and it will never end like wtf doesent it make you think Lol

2007-08-16 00:14:26 · 8 answers · asked by DarknessXII 2 in Astronomy & Space

2007-08-16 00:03:26 · 7 answers · asked by dying2cu 1 in Mathematics