Chemistry - May 2007

the following:
A. Assuming an ideal gas, the volume occupied by 20.0 kilograms of aluminum vapor at its boiling point and under a pressure of 2280 torr.
B. The volume occupied by 1000. kilograms of metal at 25 C.
C. If the specific heat capacity of aluminum metal is 0.89 Joules per grams-degree C, how many calories of energy are required to heat 10 kilomoles of aluminum from 250 C to 500C.
D. If 13.5 grams of aluminum were dissolved in an excess of concentrated HCI, what volume of hydrogen gas would be released at STP? You may assume that the ideal gas law holds and that the vapor pressure of water is negligible compared to the pressure of the released hydrogen.

2007-05-30 15:54:05 · 1 answers · asked by Anonymous

using acronyms or something like that.

2007-05-30 15:45:27 · 3 answers · asked by NIRANJAN 1

2007-05-30 15:24:53 · 2 answers · asked by ash_rash_13 1

help!

2007-05-30 15:23:59 · 2 answers · asked by dc4lyfe310 2

2007-05-30 15:20:30 · 6 answers · asked by ash_rash_13 1

chromate, 100 grams of barium chloride is mixed with 1050 grams of water to make a barium chloride solution, which has a volume of exactly 1000 ml. It is titrated with a solution of 100. grams of potassium chromate dissolved in sufficient water to make exactly 5000 ml of solution. Calculate the following:
A. The mass percent of the barium chloride
B. The molarity of the potassium chromate solution
C. The volume of potassium chromate solution required to react with all the barium chloride solution
D. If 200. grams of barium chloride were dissolved in suffcient water to make 2 liters, how many grams of potassium chromate would be required to react completly with all the barium chloride?

2007-05-30 15:04:17 · 1 answers · asked by Anonymous

2007-05-30 15:03:52 · 1 answers · asked by m&ms 1

Please don't give me the obvious ones.

2007-05-30 15:00:53 · 2 answers · asked by Psyche 3

2007-05-30 14:54:01 · 2 answers · asked by chincou 1

dose anyone no the answer to these questions.

(1.) horizontal rows on the periodic table are called?

(2.) All the elements in a horizontal row have what one thing in common?

2007-05-30 14:54:00 · 4 answers · asked by Someone in gresham 1

2007-05-30 14:39:13 · 3 answers · asked by anonymous101 3

Benzene's density is 0.88 gm/ml, its heat of vaporization is 20.0 KJoules per mole, its heat of fusion is 10.0 KJoules per mole, its heat capacity is 0.50 KJoules per mole-degree C for liquid benzene, o.25 KJoules per mole-degree C for solid benzene, and 0.125 KJoules per mole-degree C for gaseous benzene. Calculate the following:
A. The energy required to heat 390. grams of benzene from 300 C to 600 C.
B. The energy requred to cool 3.90 micrograms of benzene from 60 C to 20 C.
C. The energy removed to heat 39.0 kilograms of benzene from -100 C to -50 C.
D. The volume occupied by 1 kilomole of liquid benzene at 25 C and the volume occupied by 1 nanomole of benzene as a vapor at STP (assume an ideal gas)

2007-05-30 14:37:10 · 2 answers · asked by Anonymous

A sample of argon has a volume of 0.43 mL at 24 degrees C. At what temperature in degrees Celcius will it have at a volume of 0.57 mL at constant pressure?

2007-05-30 14:19:51 · 2 answers · asked by 1234567890 5

2007-05-30 13:05:39 · 1 answers · asked by sexy_cutie84 1

for lab we had to do chromatography on shirts and i missed the lab but my teacher still wants me to do the assignment for it, which is to write a paragraph that defines chromatography and tells what the rubbing alcohol, tshirt, and marker represented CAN SOMEONE PLEASE HELP...

2007-05-30 12:59:14 · 1 answers · asked by Anonymous

2007-05-30 12:26:08 · 1 answers · asked by this1dude_07 1

a.) ionic bonds
b.) covalent bonds
c.) radioactive bonds
d.) metallic bonds

Please don't answer if you don't know...

2007-05-30 12:15:00 · 6 answers · asked by ? 2

this is a science question

2007-05-30 12:09:57 · 3 answers · asked by bascketballbro 1

2007-05-30 12:07:25 · 1 answers · asked by bascketballbro 1

Okay so NaHCO3 + CH3COOH ———> NaCH3COO + H2O + CO2 right?...so if i used 1.02 grams of the base 10 ml of the acid and after heating until all the water evaporated and ended up with 1.0 gram of white residue(sodium acetate) would that make sense? Also could you show me how would i calculate the concentration of the acid and the amount of water and carbon dioxide produced?

2007-05-30 12:05:00 · 1 answers · asked by Anonymous

Molar mass and acid dissociation constant of aspirin can be determined in a titration experiment. A 1.00g sample of aspirin is dissolved to make 500 mL of solution. 50.0 mL of this solution is titrated with .02450 M NaOH and the endpoint is determined to occur at 22.66 mL. The titration curve shows only one endpoint with a ph of 7.37.
(a)calculate the molar mass of monoprotic aspirin molecule.
(b)calculate the concentration of the sodium salt of aspirin at the endpoint and then calculate Ka for aspirin
(c) Using the Ka from part (b) for what pH range can aspirin and it's sodium salt be used as a buffer?
(d)If the sodium salt of aspirin is written as NaA write the hydrolysis reaction for the sodium salt and determine it's equilibrium constant

2007-05-30 11:56:06 · 1 answers · asked by Anonymous

Reduce the following complete equations to net ionic form:
a. 6Cr(NO3)2 + 3CuSO4 ---> 3Cu + 4Cr(NO3)3 + Cr2(SO4)3
b. H2SO4 ---> H20 + SO3
c. P4 O10 + 6 H20 ---> 4H3PO4
d. 4CuCNS + 7KlO3 + 14HCl ---> 4HCN + 4CuSO4 + 7ICI + 7KCl+5H20

2007-05-30 11:55:01 · 2 answers · asked by San Fran Kid 2

the buffers Na2HPO4 and Na3PO4

2007-05-30 11:26:20 · 1 answers · asked by Anonymous

Alrighty. We are doing molecular models of atoms in class. I am totally flippin lost. We were given a practice sheet to do. I'm still lost. Basically, I have a list of molecules. The list is:

BF4-

CCl4

H2Se

TeO2

SeO3 2-

PF5

HgBr2

PO3 -3

CH2Br2

S2O3 2-

No2-

BrF3

NH4 +

BrO3-

AsF5

ICl3

SeF4

XeF4

And for each of these I need to know the:

-Dot requirement
-Dot formula
-Electronic geometry
-Molecular geometry
-Whether each molecule is semetrical or not
-Whether each molecule is polar, or not
-The distribution of electrons in shells beyond its "base" noble gas
-And the hybridization of each molecule

I will send $20 bucks to the first person who answers this if they include their address. Swear on my left nad. Good karma will shower you to boot. I realize this is a lot to ask but I'm so lost and could really use the help/any tricks to figuring this out.

Keep in mind that I'm a wee bit dense, so explain this step by step.

2007-05-30 11:07:26 · 1 answers · asked by Anonymous

the buffers Na2HPO4 and Na3PO4

2007-05-30 11:03:54 · 2 answers · asked by Anonymous

How would I find out the H+ concentration in a 0.0200M acetic acid solution?

2007-05-30 11:03:13 · 2 answers · asked by glance 3

So.. I left a bottle of water in the freezer for maybe 4-8 hours.... (I don't really know exactly somewhere around there...) It was on it's side and clear. Not frozen or filled with ice at all... And the i picked it up and suddenly it just froze and got icy and ice appeared! Any explanation?

2007-05-30 11:01:30 · 4 answers · asked by ... 3

calculate the pressure of 2.78 g of Ne in a 5.00 L flask at -10 degrees C.

2007-05-30 10:58:48 · 4 answers · asked by Jasmeen 3

Na2HPO4
Na3PO4

2007-05-30 10:55:51 · 1 answers · asked by Anonymous

For each of the following reactions label the acid, base, conjugate acid, and conjugate base.
a. NH3(g) +H30(aq)---> NH4(aq) +H20(l)
b. CH3OH(l) + NH2- (aq) ---> CH3O- (aq) + NH3(g)
c. OH- (aq) + H30(aq) ---> H20(l) + H20(l)
d. NH2-(aq) +H20(l) ---> NH3(g) + OH- (aq)

2007-05-30 10:34:54 · 2 answers · asked by San Fran Kid 2