Chemistry - February 2007

The vapor pressure of pure CH2Cl2 (with molecular weight 85 g/mol) is 133 torr at 0˚C and the vapor pressure of pure CH2Br2 (with molecular weight 174 g/mol) is 11 torr at the same temperature.
What is the total vapor pressure at 0˚C of a solution prepared from equal masses of these two substances?

2007-02-01 14:06:29 · 1 answers · asked by Everyone 4

2007-02-01 14:04:11 · 2 answers · asked by . 6

Write the equation for the dissolution of magnesium chlorate in water. How
many moles of ions are produced for every 4.10 mol of magnesium chlorate
dissolved?

2007-02-01 13:57:21 · 2 answers · asked by TariSAnGel 1

ok we did this lab that had a chemical eq.
Na2CO3 + 2HCl --> 2NaCl + HOH + CO2
i need to figure out the number of moles of NaCl produced what numbers would I use to figure this out??

2007-02-01 13:45:06 · 6 answers · asked by treesap7h 2

i keep doing this problem but my answer sheet saws the answer is wrong...how do you solve it?

Bromine and chlorine gases react to produce bromine monochloride according to the equation below. The equilibrium constant, Kc for the reaction is 36.0 under the conditions of the experiment.
Br2(g) + Cl2(g) <=> 2 BrCl(g)
If 0.180 moles of Br2(g) and 0.180 moles of Cl2(g) are introduced into a 3.0 L flask and allowed to reach equilibrium, what is the equilibrium molar concentration of BrCl(g)?

2007-02-01 13:44:53 · 1 answers · asked by Anonymous

Why should the properties of structural isomers differ?

2007-02-01 13:27:16 · 3 answers · asked by Master 2

2007-02-01 13:21:11 · 4 answers · asked by Anonymous

Also is there an equation to represent this?

2007-02-01 13:19:24 · 2 answers · asked by Anonymous

Like, if I had a statue made of pure nickel that was the same volume as a human, what would it weigh?

2007-02-01 13:17:53 · 5 answers · asked by Adam S 2

My Science book isn't really telling me much so can you help me plz?

2007-02-01 13:09:02 · 1 answers · asked by Shane H 1

i.e. how many grams per mole, how many atoms per mole, etc.

2007-02-01 13:07:05 · 4 answers · asked by Ciavana 3

A decomposition reaction has a rate constant of 0.0012 yr^-1. (a) What is the half-life of the reaction? (b) How long does it take for [reactant] to reach 12.5% of its original value?

A decompoition reaction has a rate constant of 0.008. What is it's half-life value? (Show how you got it)

2007-02-01 12:55:31 · 2 answers · asked by Cupcake 2

2007-02-01 12:55:27 · 1 answers · asked by Anonymous

A(g) + B(g) ---> C(g)

The rate law for the above reaction is:

-d[A]/dt = k[A][B]

The rate constant is 2.90×10-4 L mol-1 s-1 at 339°C and 4.24×10-2 L mol-1 s-1 at 533°C.

Use the Arrhenius equation

k = Ae-Ea/RT

to:

Calculate Ea for this reaction.
1.05×102 kJ/mol

Calculate the rate constant k at 413°C for this reaction.

i know there is one formula like ln(k2/k1)=Ea/R(1/T1-1/T2)

can anybody helps please?i have no idea how to do this..

2007-02-01 12:26:27 · 1 answers · asked by ichigokun 1

Just trying to resolve a dispute with my professor.

2007-02-01 12:24:16 · 2 answers · asked by Anonymous

this is called,

a) ionic bonding
b) covalent bonding
c) polar covalent bonding
d) delocalization of the electrons
e) a dipole moment

2007-02-01 12:17:51 · 2 answers · asked by insaneaznskillz 1

2007-02-01 12:16:44 · 3 answers · asked by jasmin c 1

which one of these is a gas...

H2Co3 or Ca(C2H3O2)2

2007-02-01 12:00:22 · 3 answers · asked by Anonymous

Hi there, people only answer if u are a qualified scientist or higher education student studying science.

I am currently doing a piece of cwrk on finding out if a person has been murdered, i carried out a titration using HCl with the sample of milk of magnesia.

however, the results that i obtained were very irregular and appeared to have no pattern. so i had no 3 results that were within 0.1 of each other :(

what does this mean? is the milk of magnesia contaminated?

What does a titration actually show? i cannot ask the tutors because they threaten to lower our marks if we are given help :|

2007-02-01 11:57:50 · 2 answers · asked by katie_orlandoarogorn 2

I have tried this a bunch of times, but i cant seem to figure it out. Could you please help me? Or at least give me a clue how to solve it. There is supposed to be a coefficient before every molecule in this equation.

2007-02-01 11:56:58 · 6 answers · asked by martinashasha 2

Ammonium Sulfate can be synthesized by bubbling ammonia gas through sulfuric acid. what volume of ammonia at STP is required to produce 1.0 kg of the Salt?

What salt are they talking about?
And what does salt mean in this context?

2007-02-01 11:56:50 · 1 answers · asked by Brandon 2

how do i convert 1.0L into mol

2007-02-01 11:39:48 · 2 answers · asked by Anonymous

How do I safely transport,store, and handle potassium chlorate? How about with potassium perchlorate?

2007-02-01 11:39:03 · 2 answers · asked by Sliceathroat 3

Chlorine is prepared industrially by passing an electric current through brine, a concentrated solution of sodium chloride.
2NaCl + 2H2O → 2NaOH + Cl2 +H2
All three products are commercially valuable. If 1500 g of a brine solution that is 24% NaCl by mass is used, how many grams of each product can be produced?

2007-02-01 11:32:27 · 2 answers · asked by San Fran Kid 2

what are the products of a chemical reaction between sodium hydroxide and Vinegar

2007-02-01 11:29:02 · 1 answers · asked by Anonymous

I ask this because i just read that weapons grade has to be 95 percent but, power plant grade is only 5. Why not the other way is 95 percent closer to being plutonium? and why can't we use plutonium for power plants? all a nuclear plant is is a large steam engine right?

2007-02-01 11:25:11 · 3 answers · asked by heavyhauldad 3

2007-02-01 11:18:33 · 11 answers · asked by chandra s 1

2007-02-01 11:09:37 · 4 answers · asked by ATGI 2

2007-02-01 10:55:44 · 6 answers · asked by Anonymous

I have a bunch of word equations(chemistry ones) that I have little to no idea on how to solve them. If you can help solve at least one of them, that would be of great help. Thanks in advance. Here they are:
1. sodium phosphate + calcium chloride yield(that's the arrow pointing from the reactant to the product)calcium phosphate + sodium chloride
2. potassium chlorate yields potassium chloride + oxygen gas
3. calcium hydroxide + phosphoric acid yield calcium phosphate + water
4. copper + sulfuric acid yield copper(II) sulfate + water + sulfur dioxide
5. hydrogen + nitrogen monoxide yield water+ nitrogen

In case some of you don't know what I'm talking about, I'm supposed to change the words into the actual symbols and numbers. For example, this is what it's supposed to lok like: N2 + H2 ----> NH3. All the numbers are supposed to be subscript. Please put the # of the one yo olved next to it If you can figure these out, that's be great. If not, well, then, you get two free points=)

2007-02-01 10:53:38 · 3 answers · asked by Dana Mulder 4