Chemistry - March 2007

a) what is the mass of H20 produced from the reaction of 6.3g of propane?

b)how many molecules of H2O are produced when 2 moles of O2 are reacted with axcess of propane?

c)how many atoms of hydrogen in water are produced when 2.4 moles of propane are reacted?

d)how many molecules of CO2 are produced when 2.3 x 10^6 atoms of O2 are reacted?

e)what is mass of CO2 produced when 6.5g of propane is reacted with 14.2g of O2?

2007-03-08 01:55:37 · 1 answers · asked by ZulMalay 1

2007-03-08 01:44:48 · 2 answers · asked by devone l 1

a. 2-bromoethanol and 1,2-dibromoethane
b. 2-hexanol and 1-hexene
c. 1-chloro-2-methyl-2-propanol and 1,2-dichloro-2-methylpropane
d. n-pentyne and 2-pentyne
e. butyl bromide and butane

2007-03-08 01:37:59 · 2 answers · asked by Anonymous

A solution of HCl has a pH of 2.7. How many grams of HCl are there in 319 mL of this solution?

2007-03-08 01:34:28 · 1 answers · asked by Ryan C 1

an artificial atmosphere for the planet mars consists of 80% carbon dioxide gas (CO2) 15% methane gas (CH4) and 5% nitrogen gas (N2). 10.0g of this gas mixture is placed in a 100L container at temperature of 4 degre Celcius .

2007-03-08 01:15:19 · 2 answers · asked by ZulMalay 1

iodine and oxygen combine to form oxoanions.
Give the name and formula of the oxoanions of iodine made up of one atom of oxygen and one atom of iodine.
Give the name and formula of the corresponding oxoacide.

2007-03-08 01:07:12 · 2 answers · asked by ZulMalay 1

2007-03-08 01:06:11 · 4 answers · asked by chrischapman89 1

I am having trouble understanding solubility.

Calculate the solubility of LaF3 in grams per liter in the following:

Pure water

0.025 M KF solution

0.150 M LaCl3 solution

2007-03-08 00:46:13 · 2 answers · asked by bosox1989 1

of this solution? how many formula units are in 1.0 dm3?

2007-03-08 00:41:22 · 2 answers · asked by Z 1

I need help with this chemistry problem for my AP review. I don't understand how to calculate it with the given information.

A 1 L solution saturated at 25 degrees C with lead(II) iodide contains 0.54 g of PbI2. Calculate the solubility-product constant for this salt at 25 degrees C

Thanks in advance for the help

2007-03-08 00:40:52 · 3 answers · asked by bosox1989 1

deposite chokes water out let pipe line completely : (

2007-03-08 00:36:32 · 3 answers · asked by oli 1

give me the details on how water purefied

2007-03-08 00:12:21 · 5 answers · asked by MANNY05 1

1. Cholesterol, an important steroid found in nearly all human body tissue, contains 84.0% carbon by weight. If cholesterol has a molecular weight of 386, how many carbon atoms are there in each molecule of cholesterol?
a) 7
b) 14
c) 27
d) 32
e) 64

2. In sodium hydroxide, the percentage of oxygen by mass is nearest to
a) 20%
b) 40%
c) 60%
d) 80%
e) 90%

3. Which one of the following formulas is an empirical one?
a) C3H8
b) HCOOCH3
c) H2C2O4
d) CH3COOH
e) C6H6

4. Cyclohexane molecules contain only carbon and hydrogen. If there are twice as many hydrogen atoms as carbon, and cyclohexane has a molar mass of 84g, what is its true formula?
a) C5H24
b) C12H6
c) C8H4
d) CH2
e) C6H12

Thankyou for helping. Please be 100% certain of your answers. If possible please explain why it is those particular answers for each of the questions.

2007-03-08 00:00:12 · 2 answers · asked by Anonymous

urgent, thx a lot

2007-03-07 23:23:02 · 1 answers · asked by eugene c 1

i put 104 microlitres of propofol at 97% into 100ml. i believe that made me a 1% solution (lab techs workings). the propofol came in a 100ml solution from sigma aldrich.

link:http://www.sigmaaldrich.com/catalog/search/ProductDetail/ALDRICH/D126608

Thanks!

2007-03-07 23:11:22 · 3 answers · asked by jim j 2

im a mentos gum addct.. can the menthol make a person barren? (cant have children)

2007-03-07 22:24:35 · 1 answers · asked by Anonymous

I need any processed data for this lab. I need it for calculating error propagation. Without it the lab wont make sense. Anyone with useful answers?

2007-03-07 22:21:57 · 2 answers · asked by Mazaher 2

hows is it done? and how it is extracted from the mixture?

2007-03-07 22:15:59 · 1 answers · asked by com951357 2

Which of the following statements is incorrect?



a. If NaCl is dissolved in water, the solute particles are Na+ and Cl- ions.

b. Metal alloys are solid-state solutions.

c. Dispersed particles in solutions are too small to be seen using visible light, even with powerful microscopes.

d. Air is a gaseous solution made up of nitrogen, oxygen, argon and other gases in small amounts.

e. Samples taken from different parts of a solution may have different compositions.

2007-03-07 22:04:09 · 2 answers · asked by satish r 1

2007-03-07 21:37:52 · 5 answers · asked by pardes yes 1

2007-03-07 21:30:04 · 12 answers · asked by Anonymous

An ideal gas occupies a volume of 3.2 L at 31oC and 303.0 mm Hg. What volume in L will it occupy at STP?

2007-03-07 21:25:46 · 4 answers · asked by satish r 1

2007-03-07 21:22:56 · 1 answers · asked by anish 2

Not including lava, or acid so strong it'll melt the boat. I mean something thats classed as a liquid but not dense enough to float a boat...

2007-03-07 21:12:44 · 6 answers · asked by Chris O 2

2007-03-07 20:54:31 · 4 answers · asked by Anonymous

whats so special about it and why is it the only one of its group on the new periodic table in aspidium.

2007-03-07 20:53:21 · 2 answers · asked by Aaron S 1

2007-03-07 20:48:59 · 1 answers · asked by subisilver234 1

This talking about car lead cell battries and dry cell battries.

2007-03-07 20:19:55 · 2 answers · asked by katib2003 1

Enzyme 1 has km=5, specific activity = 103 u/mg

Enzyme 2 has km=130, specific activity = 811 u/mg

Let us simulate conditions in the stomach where there is excess of substrate such that all enzymes are continually saturated, and the products are constantly taken away.

Which is more effecient? For a given period of time, which one would end up with more products?

I am expecting enzyme 2 would have more products because of the higher specific activity. Am I right in assuming this? I have no idea how the km value would affect the efficiencies of the enzymes.

'grateful for any help here.

2007-03-07 20:00:16 · 1 answers · asked by justine d 2

plz answer with detail.

2007-03-07 19:39:56 · 3 answers · asked by ZulMalay 1