Chemistry - June 2007

A sample of ascorbic acid (vitamin c) is synthesized in the laboratory. It contains 1.5 grams of carbon and 2.00 grams of oxygen. Another sample of ascorbic acid isolated from citrus fruits contains 6.35 grams of carbon. How many grams of oxygen does it contain? Which law you assuming in answering this question?

2007-06-20 09:34:39 · 3 answers · asked by georgie0515 1

The mole ratio of

CO2 to C6H12O6

in the equation

6CO2 + 6H2O --> C6H12O6 + 6O2 is

6:6

1:1

6:1

1:6

2007-06-20 09:32:05 · 4 answers · asked by n r 1

I'm writing a book and the main characters need to destroy a building filled with vampires. I have them breaking into an excavating company's warehouse and stealing 3 sticks of dynamite. My question is, how do they like, set it off? Should i just be vague and say "they set it up" or something? I tried to google around but I can't find anything and I'm afriad to dig too deep because it could be a touchy subject..

Any help/advice would be appreciated.

2007-06-20 07:52:18 · 5 answers · asked by Eileen 5

2007-06-20 07:29:32 · 3 answers · asked by o.0 2

The equation is H2SO4+2KOH-->K2SO4+2H2O

PLease help!

2007-06-20 07:26:33 · 3 answers · asked by Anonymous

2007-06-20 06:53:08 · 4 answers · asked by ibid 3

2007-06-20 06:41:22 · 4 answers · asked by Anonymous

2007-06-20 06:02:16 · 4 answers · asked by bullet 2

It's been awhile and I don't know where to start with this problem =( help me gurus!

Determine how many grams of gold (Au) and how many grams of silver (Ag) are in a crown that has a mass of 2277g and a total volume of 165cm^3. Assuming the crown is made entirely of gold and silver. The densities of AG and Au are 10.5g/cm^3 and 19.3g/cm^3 respectively.

2007-06-20 06:00:57 · 3 answers · asked by Vpow 1

Can someone please help me calculated how many grams of methane (CH4) are in a sealed 80 mL flask at room temperature (22C) and 780 mm Hg of pressure.

2007-06-20 05:47:05 · 7 answers · asked by Tata 1

What is special about the 5- and 6- coordinate molecular geometries?

2007-06-20 05:45:51 · 2 answers · asked by Smokey. 6

2007-06-20 05:40:53 · 6 answers · asked by Anonymous

The equilibrium constants for three different reactions are
i) Ke = 1.5 x 10^12
ii) Ke= 0.15
iii) Ke= 4.3 x 10^-15

in which reaction is:
a) the ratio of product to reactant larger?
b) the ratio of product to reactant small?

and...

why is it necessary to specify the temp when giving a value for Ke?

any help would be appreciated!! thanks!

2007-06-20 05:26:04 · 5 answers · asked by Anonymous

basics

2007-06-20 05:24:50 · 3 answers · asked by mrpaul1112 2

There is a clothes line pole at my house and it is very rusty and i would like to know a few things before i replace it. What is rust? and how do you prevent corrosion?

2007-06-20 04:54:08 · 8 answers · asked by Anonymous

A 25 g sample of a substance requires 25 calories to raise its temperature from 23 degrees C to 28 degrees C. What is the specific heat of the substance?

2007-06-20 04:47:23 · 5 answers · asked by RR Chic 1

What is the molar solubility of silver oxalate? (Ksp for Ag2C2O4 is 5.4 * 10^-12)

2007-06-20 04:45:22 · 5 answers · asked by Anonymous

A) 358
B) 0.054
C) 6.3050
D) 0.0105
E) 7.0500 x 10^-3

2007-06-20 04:27:49 · 4 answers · asked by SICK MY DUCK! 1

A) 358
B) 0.054
C) 6.3050
D) 0.0105
E) 7.0500 x 10^-3

2007-06-20 04:10:52 · 6 answers · asked by SICK MY DUCK! 1

In the reaction
2AgI + HgI2= Ag2HgI4
5.59 g of AgI and 2.63 g of HgI2 were used. Assuming complete reaction of the limiting reagent, what mass of the excess reagent remains?

2007-06-20 03:56:10 · 0 answers · asked by Anonymous

i am doing a chemistry project now....but i cannot find about these material harmful. all harmful is ok.

2007-06-20 02:44:18 · 3 answers · asked by Jackel 1

well we have this homework, and we are given a table with values of temperature and vapor pressure, and we have to find the boiling point of an object for example:

temperature vapor pressure
70 degrees celcius 542.5 mm Hg
80 degrees celcius 812.6 mm Hg

well iknow that for an object to boil it must equalize the atmospheric pressure 760 mm hg or 760 torr. i also know that 760 is given between those two pressures, and therefore the boiling point is between 70 and 80 degrees. what i don't know is the formula how to find the exact temperature between the two given temperature and pressures. please i need ur help and the derivation of the formula would be very much appreciated, and would prefereably be something from the boyle's or charles's law. thank you!!

2007-06-20 02:32:03 · 2 answers · asked by Scarlet Mist 2

6.85L of gas is collected over a body of water at 6 degrees Celsius. The vapour pressure is 4.18 kPa. What is the volume of the dried gas?

Can someone walk me through this problem please? I need to know for my exam in a few hours!

2007-06-20 01:54:41 · 1 answers · asked by Anonymous

i think salt solution is a mixture and bronze is a mixture. Am i right?

2007-06-20 01:50:44 · 2 answers · asked by Anonymous

The mass of methane discovered under the surface of the earth is made of the elements hydrogen and carbon in the ratio of 1/3

2007-06-20 01:46:12 · 2 answers · asked by trent b 1

2007-06-20 00:59:19 · 1 answers · asked by Anonymous

enzyme essay by titration with 0.1 N NaOH using substrate contain ethyl butyrate 1ml and 0.3M potassium Phosphate buffer pH 7.0.and 5 drops of 1% phynolphthelein .

2007-06-20 00:55:15 · 2 answers · asked by mahi 1

relate the reactions to the properties of the functional group present in the molecule.

2007-06-20 00:50:33 · 1 answers · asked by harriet w 1

I need to bring down the sulphate impurity level to around 20 ppm from about 0.04% level.

2007-06-20 00:31:58 · 1 answers · asked by sandysurd 2

and the following data:
[O2]=(1) 0.001, (2) 0.004, (3) 0.004

[NO]=(1) 0.0001, (2) 0.001, (3) 0.003

Rate of formation of NO2=(1) 7.10, (2) 28.4, (3) 255.6

What is the rate law for this reaction?
a. rate=K[O2][NO]2
b. rate=K[O2]2[NO]
c. rate=K[O2]2[NO]2
d. rate=K[O2][NO]3

Also, what is the value for the rate constant k?
a. 510
b. 334
c. 0.293
d. 7.1 x 109

2007-06-20 00:27:02 · 1 answers · asked by janeeyre444 1