Chemistry - March 2007

A solution of sodium chloride in water has a vapor pressure of 20.9 torr at 25 degrees C. What is the mole fraction of NaCl solute particles in this solution?
What would be the vapor pressure of this solution at 45 degrees C? The vapor pressure of pure water is 23.8 torr at 25 degrees C and 71.9 torr at 45 degrees C and assume sodium chloride exists as Na+ and Cl- ions in solution.

2007-03-07 06:24:34 · 1 answers · asked by westafrica88 1

My professor has assigned us to write an essay on the following equilibrium equation.

H2(g) + I2(g) « 2 HI(g)

What happens in the container on the molecular level as the reaction starts and then reaches equilibrium?

Basically we are suppose to write an essay of 300 words regarding this and I do not know what happens and I can't figure it out from the research I have done.

If anyone can give me a start to this or any clues to how to figure this out...that would be GREAT!!

Thanks!

2007-03-07 06:09:29 · 2 answers · asked by who knows 2

just wondering really

2007-03-07 05:35:15 · 5 answers · asked by Anonymous

12 mg of a certain protein was dissolved in water to make a solution of 2.00 mL at 22C. If the osmotic pressure is 1.15 torr, what is the molecular mass of the protein?

2007-03-07 05:33:46 · 2 answers · asked by Gemini 2

1. Plantinum is added to a mixture of sulfur and oxygen speeding the production of sulfur trioxide.

a. temperature c. surface area of reactants
b. concentration d. presence of a catalyst
of reactants

2. A chemist speeds up a reaction by stirring a solid in a liquid with
which it reacts.

a. temperature c. surface area of reactants
b. concentration d. presence of a catalyst
of reactants

3. Under some conditions an instant photograph develops faster when placed in a pocket close to the photographers body.

a. temperature c. surface area of reactants
b. concentration d. presence of a catalyst
of reactants

4. Some people are unable to digest milk products effectively because they lack a certain enzyme.

a. temperature c. surface area of reactants
b. concentration d. presence of a catalyst
of reactants

2007-03-07 05:30:21 · 4 answers · asked by Anonymous

22 mg of a certain protein was dissolved in water to make a solution of 2.50 mL at 26C. If the osmotic pressure is 1.30 torr.

2007-03-07 05:19:38 · 1 answers · asked by simonkf2002 1

2007-03-07 05:14:16 · 3 answers · asked by i-sena 1

2007-03-07 05:11:03 · 1 answers · asked by i-sena 1

identify the hybridization of the central atom for both

TeCl4 and BrO3-

2007-03-07 04:57:47 · 2 answers · asked by garture 1

2007-03-07 04:57:39 · 6 answers · asked by DEBANJAN D 1

what volumes of 0.58M HNO2 and 0.59 NaNO2 must be mixed to prepare 1.00 L of solution buffered at pH=3.46

2007-03-07 04:42:52 · 1 answers · asked by tanny 1

2007-03-07 04:30:43 · 7 answers · asked by arminekirakosyan 1

2007-03-07 04:29:07 · 2 answers · asked by Swiss Rugger 1

Example: NaOH reacting with HCl(strong) has a heat of reaction of -41.8, and NaOH reacting with acetic acid(weak) has a heat of reaction of 41.98.

2007-03-07 04:28:57 · 4 answers · asked by pelicangirl 1

12 mg of a certain protein was dissolved in water to make a solution of 3.00 mL at 23C. If the osmotic pressure is 1.15 torr, what is the molecular mass of the protein?



To enter an answer in scientific notation use an e

6.022 x 1023 = 6.022e23

1.340 x 10-8 = 1.340e-8

2007-03-07 03:50:12 · 2 answers · asked by Foxychick 1

After conducting an experiment with powdered copper, I saw that with each heating the copper gained in mass. Why does this occur?

2007-03-07 03:45:54 · 1 answers · asked by Ashley 2

2007-03-07 03:29:36 · 2 answers · asked by ainul m 1

There are many substances that can be added to water to lower its freezing point but I have never heard of anything that raises it. Room temperature ice would be cool. (pun intended)

2007-03-07 03:23:51 · 6 answers · asked by gliss 2

Help me explain the following:
1. What is the role of CCl4 in bromination reactions? Howcan it fulfill its role?
2. Explain why terminal alkynes are acidic.
3. Explain the bromination reaction of benzene, toluene, and cyclohexane.
4. Give the reagent and the reaction conditions that would distinguish between the ff. compounds:
a. benzene and ethylbenzene
b. 1-butyne and 2-butyne
c. 2-methypentane and 2-methyl-2-pentene
d. toluene and 1-methylcyclohexane


Thanks in advance!

2007-03-07 03:21:33 · 1 answers · asked by Anonymous

1)If 14.40 grams of RbCl are dissolved in water to make a solution of 0.224 L, the density is found to be 1.047 g/cm3. Calculate the molality of the solute.
2)10 mg of a certain protein was dissolved in water to make a solution of 4.00 mL at 22C. If the osmotic pressure is 1.35 torr, what is the molecular mass of the protein?

2007-03-07 02:58:12 · 1 answers · asked by Yessica 1

Lab Question (Based on your aluminum foil sample) If the population of the world is 5.6 x 10^9 individuals, how many aluminum atoms could you distribute to each person from your sample of aluminum foil?

2007-03-07 02:42:37 · 3 answers · asked by therockj14 2

2007-03-07 02:38:41 · 7 answers · asked by srikanth 1

I want to search the intact sector in journal of oriental chemistry

2007-03-07 02:36:44 · 1 answers · asked by brahmareddybhsb 1

Chemical or physical reaction?

Why?

2007-03-07 02:18:32 · 4 answers · asked by Dude 3

how many moles of oxygen are needed to reactwith 100g of sodium to produce sodium oxide.can you please write the answer and the and the chemical reaction...

2007-03-07 01:57:20 · 3 answers · asked by aly 1

2007-03-07 01:53:38 · 2 answers · asked by notso_recoveringwino 2

then the green color of the ferrus sulphate crystals changes to what color??

2007-03-07 01:49:24 · 2 answers · asked by trisha 2

Chemistry stuff please help

2007-03-07 01:42:18 · 3 answers · asked by John W 1

2007-03-07 01:33:52 · 12 answers · asked by kellie_city 1

If before Adsorption I had 550 cm3 of NaOH and after adsorption I had 482cm3 of NaOH?

2007-03-07 01:27:16 · 2 answers · asked by Anonymous