Chemistry - April 2007

Does anyone on here have Yahoo! Messenger and is willing to help me understand my Chemistry? I am in Normality, Molality, Molarity, Percent By Mass and PPM and I pretty much understand everything except Molality.

There are 4 problems I got completely wrong, and it would be great if someone could walk me through solving them.

1.) calculate the molality of a 25% sulfic acid solution.

2. )Calculate the normality of 7,00 m (molality) Phosporic acid solution (density of solution= 1.2 g/mL) in reactions that replace all hydrogen ions.

3.)Calculate the Molarity of a 2.5 m ethyl Alcohol (C2H6O) solution (density of solution= .941 g/mL)

4.) Calculate the percent by mass of a 3.75 m Phosphoric acid solution.

Any help from anyone would be great!

2007-04-04 11:36:12 · 1 answers · asked by C 1

Like, is it the 3rd, 4th, most common element on earth?

2007-04-04 11:23:17 · 8 answers · asked by Anonymous

A. Study Chemistry
B. Study Physics
C. Study Literature

You may only choose one.

2007-04-04 11:17:59 · 20 answers · asked by Lefty 3

kilojoules given off when 12g of steam condenses at 100 C and the liquid cools to 0 C.....i cant seem to calcualte this right because when i do im getting huge numbers.

2007-04-04 11:01:03 · 2 answers · asked by orange_crush_05 6

Can someone translate these into universal language and then balance them? The help will be much appreciated.

1. Aluminum fluoride and sulfuric acid react to yield aluminum sulfate and hydrogen fluoride.

2. Iron (III) chloride and sulfuric acid react to yield iron (III) sulfate and hydrochloric acid.

3. Calcium and water react to yield calcium hydroxide and hydrogen gas.

4. Barium bromide and sodium phosphate react to yield barium phosphate and sodium bromide.

2007-04-04 10:57:56 · 1 answers · asked by PIMP I 1

2007-04-04 10:51:46 · 4 answers · asked by DENNIS G 1

its extra credit so i'm not trying to cheat I just need to get my grade up!!(majorly)

2007-04-04 10:49:58 · 3 answers · asked by Jordyn N 2

Doing this chemistry homework..
I swear I never learned any of this.
Anyway,
given this equilibrium equation at 298 K:

.....................................H20........................................................
KNO3(s) + 34.89kJ <<<>>> K(aq)+ NO3

Describe, in terms of LeChatelier's Principle, why an increase in temperature increases the solubility of KNO3.


I also have this question. I did it, but Im not sure of my answer:
The Equation indicates that KNO3 has formed a saturated solution. Explain, in terms of equilibrium, why the solution is saturated.


Thank you in advance for all help given! I really appreciate it!

2007-04-04 10:47:10 · 3 answers · asked by The Phantomess of the Opera . 1

What is the net ionic equation for
NaOH+FeCl ---> Fe(OH)3+NaCl?
I can't figure it out at all.

2007-04-04 10:44:03 · 2 answers · asked by boyfriend_love_jessica 2

2007-04-04 10:33:12 · 1 answers · asked by Anonymous

1. How many liters of oxygen are liberated when 399 grams of barium chlorate are heated to produce barium chloride and oxygen gas?

2. What volume of nitrogen gas is needed to react with 175 Liters of hydrogen gas in order to produce ammonia, NH3?

3. How many liters of oxygen are required to completely combust 1.27*10^24 molecules of pentane (C5H12) in a complete combustion reaction?

4. How many liters of chlorine gas are produced if 125 grams of sodium chloride are exposed to an electric current?

5. How many molecules of CO2 are produced when 75 grams of aluminum carbonate are heated?

6. How many grams of barium sulfate are produced if 86 grams of barium phosphate are reacted with excess sodium sulfate in a double replacement reaction?

2007-04-04 10:17:19 · 2 answers · asked by lilprincess_2good4u 1

Ammonia, NH3, is a weak base with a Kb of 1.8*10^-5.
Question 1) What is the pH of a .380 M ammonia solution?
Question 2) What is the percent ionization of ammonia at this concentration?

Please show the steps, I got a test. Thanks a bunch!!

2007-04-04 09:41:01 · 1 answers · asked by Anonymous

2007-04-04 09:36:15 · 8 answers · asked by lilamy 1

2007-04-04 09:32:23 · 4 answers · asked by shiznizzal24 2

Calculate the mass of Li formed by elecrolysis of molten LiCl by a current of 7.5 x 10^4 Amps flowing for a period of 24h. Assume the elecrolytic cell is 85% efficient.

I keep getting 4.6 X 10^5 grams of Li when the book has it as being 4.0 x 10 ^5. What am I doing wrong? I checked it like 12 times so don't just say adding them wrong. Tell me how you got the answer.

2007-04-04 09:31:12 · 2 answers · asked by __ 3

2007-04-04 09:29:33 · 4 answers · asked by Anonymous

got a bit in my mouth and rinsed but Im worried

2007-04-04 09:26:58 · 2 answers · asked by Anonymous

conc=concentration
N=normality
v= volume

2007-04-04 09:26:19 · 2 answers · asked by bo7so 1

2007-04-04 09:26:12 · 5 answers · asked by ishika65 1

2007-04-04 09:23:26 · 3 answers · asked by Jenna V 1

A gas of unknown molecular mass was allowed to effuse through a small opening under constant pressure conditions. It required 52 s for 1.0 L of the gas to effuse. Under identical experimental conditions it required 24 s for 1.0 L of O2 gas to effuse. Calculate the molar mass of the unknown gas. (Remember that the faster the rate of effusion, the shorter the time required for effusion of 1.0 L; that is, rate and time are inversely proportional.)
g/mol

2007-04-04 09:23:05 · 1 answers · asked by lsubetty 2

chemistry

2007-04-04 09:20:45 · 2 answers · asked by virtuosohockeysuperstar 1

Calculate the heat of decomposition for this process @ constant pressure & 25 degrees celsius?
CaCO3 (s) --> CaO (s) + CO2 (g) is the equation
the standard enthalpy of formation for the reactants and products are the following: CaCO3 = -1206.9, CaO = -635.6, & CO2 = -1206.9

2007-04-04 09:20:00 · 1 answers · asked by joyfulgurl4god 1

the rate of a chemical reaction normally____.
a. decreases as themperature increases
b. is slowed down by a catalyst
c. increases as reactant concentration increases
d. decreases as the reactant concentration increases


help me here -_-;;

2007-04-04 09:13:31 · 4 answers · asked by kei 2

2007-04-04 09:09:21 · 4 answers · asked by Keshia M 1

2 H2(g) + O2(g) 2 H2O(g)

i am getting -800, but it is stating that is wrong ... what am i doing wrong?

[this is a image of the bond energies]http://www.webassign.net/silber/9-02tab.gif

2007-04-04 09:09:00 · 1 answers · asked by pinay804 2

2007-04-04 09:08:08 · 3 answers · asked by Keshia M 1

2007-04-04 09:06:56 · 3 answers · asked by Keshia M 1

2007-04-04 08:56:21 · 2 answers · asked by Jenna V 1

I mean, does a rise in temperature do it? A decrease in pressure? What else?

2007-04-04 08:48:35 · 1 answers · asked by Random G 3