Chemistry - November 2006

what number of moles of O2 is needed to produce 14.2 grams of P4O10(molar mass 284 grams) from P?

2006-11-08 12:03:42 · 3 answers · asked by Amanda R 2

2006-11-08 12:00:08 · 2 answers · asked by Tina 1

2006-11-08 11:58:41 · 2 answers · asked by Tina 1

2006-11-08 11:36:56 · 1 answers · asked by Michael F 1

2006-11-08 11:26:24 · 7 answers · asked by Anonymous

I need some chemistry help. :-/

I know how to calculate Gibbs energy, ∆G=∆H-T∆S. However, I don't know how to solve it without the temperature given in the problem.

The question is: For the reaction H2O --> H2 + ½O2, the value of ∆G is
a. positive
b. negative
c. positive at low temperatures and negative at high temperatures
d. negative at low temperatures and positive at high temperatures.

The standard enthalpy of H2O is -242. The standard entropy of H2O is 188.7. The standard entropies of H2 and O2 are 130.7 and 205.1.

Could anyone please explain to me how you would go about calculating the Gibbs energy of this problem? Thank you very much.

2006-11-08 11:22:21 · 1 answers · asked by ybkid 2

When calcium reacts with aqueous hydrochloric acid, one substance produced is carbon dioxide gas according to the equation: CaCO3(s)+ HCl (aq) --CaCl2(aq)-CO2(g) + H2O
How many moles of the gas are produced for each m ole of the calcium carbonate?? balance the equation

2006-11-08 11:12:56 · 3 answers · asked by Anonymous

Chalk consists mainly of calcium carbonate, a solid that tends to be insoluble in water, but abe to dissolve in aqueous acids. If a box of chalk contains twenty pieces of chalk, and each piece has a mass of 10.0g, how many moles of calcium carbonate are present in the entire box?

2006-11-08 10:42:24 · 6 answers · asked by Anonymous

2006-11-08 10:29:45 · 2 answers · asked by czdrammaqueen 2

So if I want to find out how much mass does
0.5 moles of Fe2(SO4)3 have
Will I take 0.5 x 399.88 and if i want to know how many nmoles are in 360 grams of C6H12O6
would i then take 360/180.14 to my answer

2006-11-08 10:19:52 · 2 answers · asked by denise a 1

2006-11-08 10:16:02 · 2 answers · asked by j cool 1

2006-11-08 10:11:15 · 5 answers · asked by Tina 1

2006-11-08 10:09:50 · 1 answers · asked by gabriel c 1

what is the electron configuration of Mn(3+)

2006-11-08 09:54:49 · 2 answers · asked by Anonymous

PlZ help me this is a study guide for a huge test i have 2morrow!

2006-11-08 09:52:40 · 4 answers · asked by Anonymous

it's the molec. mass (30)/ Mass of empircal 15.04) after I divided that I got 1.995, and rounded it to two. But what do I do with the two? Do I mulitiply it by CH3 to get C2H6?? I'm confused.

2006-11-08 09:47:03 · 2 answers · asked by Anonymous

I just need someone to kind walk me throught this one: How much mass does

1 mole of Fe2(SO4)3 have?

How many moles are in

180 grams of C6H12O6

2006-11-08 09:44:02 · 3 answers · asked by denise a 1

What neutral element atom has the same electron configuration as Ti(4+)?

2006-11-08 09:39:35 · 1 answers · asked by Anonymous

2006-11-08 09:26:53 · 5 answers · asked by skyler t 2

2006-11-08 09:24:09 · 1 answers · asked by Anonymous

It has been found that when the chemical bond in a diatomic molecule Cl2, that 328 kJ is released per mole of Cl2 formed. What is the energy per Cl-Cl bond and the wavelength of light that would be required to break this bond?

2006-11-08 09:12:13 · 1 answers · asked by Anonymous

BF3+LiSO3---->B2(SO3)3+LiF
CaCO3+H3PO4----->Ca3(PO4)2+H2CO3
Ag2S---->Ag+S8

2006-11-08 08:58:47 · 4 answers · asked by denise a 1

2006-11-08 08:47:42 · 2 answers · asked by mayad 1

2006-11-08 08:46:17 · 3 answers · asked by Anonymous

2006-11-08 08:41:21 · 5 answers · asked by Tina 1

2006-11-08 08:37:32 · 2 answers · asked by Tina 1

Like are they sorted and purified, or converted into compounds.
Best answer gets 10 pts!!! Thanks in advance, angel

2006-11-08 08:33:30 · 3 answers · asked by Angel Eve 6

1.) Cr(NO2)2+(NH4)2SO4---->CrSO4+NH4NO2
2.)KNO3+H2CO3----->K2CO3+HNO3
3.)KBr+Fe(OH)3----->KOH+FeBr3
4.)B2Br6+HNO3----->B(NO3)3+HBr

2006-11-08 08:19:01 · 3 answers · asked by denise a 1

All right so I've got this question asking how to correct certain formulas. They gave me Fe2O. Since Iron has a full valence, and oxygen needs 2 more electrons for a full one, would that formula be correct? Or is that even an ionic bond? Obviously since it's between a metal and a nonmetal (oxygen) then it ought to be ionic. But what should I do for the full valence? Sorry, it might be a stupid question but someone ought to know.

2006-11-08 08:16:04 · 2 answers · asked by E 2

I am doing a report on crystal meth. How is it produced, what are the dangers, etc. any help?

2006-11-08 08:04:11 · 2 answers · asked by Meeowf 3