Chemistry - July 2007

A compound contains only carbon, hydrogen, and oxygen. Combustion of 10.68 mg of the comopund yields 16.01 mg CO2 and 4.37 mg H2O. The molar mass of the compound is 176.1 g/mol.


>>>What are the empirical and molecular formulas of the compound?

THANKS SO MUCH!!!

2007-07-31 07:14:21 · 3 answers · asked by hillybilly135 1

How many water molecules are there in 3.0 moles of water?

2007-07-31 07:13:53 · 4 answers · asked by Anonymous

NaOH and C6H5CHCHCOOH


Water and what is the salt?? thanks

2007-07-31 06:48:28 · 2 answers · asked by hillybilly135 1

Do it have any consecuence in a short time, or a long time? Im talking about a degreaser based on sodium hidroxide and sodium metasilicate. Thanks

2007-07-31 06:33:46 · 2 answers · asked by skywalkeresearcher 3

MgCO3
(NH4)SO4
KCH3COO
Cu(NO3)2
Fe2(SO4)3

2007-07-31 06:30:07 · 3 answers · asked by claudia_natacha 1

I don't need help solving it, but just understanding the context of what it's trying to ask:

Calculate the percent composition by mass of the following compounds that are important starting materials for synthethic polymers:

Ex: C3H4O2

So what is this question asking? Is it just finding what percentage an element accounts for in the whole compound?
So I would say something like Carbon accounts for 50% of the compound??

2007-07-31 05:04:09 · 7 answers · asked by Andrew 2

1.(a)Lime juice was electrolysed using carbon electrodes.
What is produced at the cathode?Write a half equation for
the reaction.

(b)A student intends to electroplate an iron key with a suitable metal to beautify it.Design a laboratory experiment to electroplate the iron key.Your answer should consist of the following:
(i)Chemicals required
(ii)Procedures of the experiment
(iii)Diagram showing the set -up of apparatus
(iv)Chemical equation involved in the reaction
(v)Observation

2007-07-31 03:18:27 · 1 answers · asked by Cloudy 1

consider the reation 2H2 + O2 --------> 2H2O

What is the ratio of the initial rate of the appearance of water to the inital rate of disappearance of oxygen?

2007-07-31 03:15:35 · 1 answers · asked by Anonymous

2007-07-31 03:15:34 · 3 answers · asked by Hari K 2

The average rate of disappearance of ozone in the atmosphere in the reation 203 (g)--------> 3O2 (g) is found to be 9.00 x 10^-3 atm over a certain interval of time. What is the rate of appearance of O2 during this interval?

2007-07-31 03:12:21 · 2 answers · asked by Anonymous

2007-07-30 22:19:14 · 6 answers · asked by Anonymous

structure of ozon, uses of ozon

2007-07-30 22:07:03 · 9 answers · asked by surya pal 1

besides telling why N2 is gaseous, plz also tell the reasons as to why other elements of group 15, combine with each other and form solids??

2007-07-30 21:59:00 · 1 answers · asked by surya 1

A)what are the similarities and differences between the hydrogen atom 2s and 3s orbtals?
B) what are the similarities and diferences between the 2s orbital and a 2p orbital?

2007-07-30 21:52:49 · 1 answers · asked by Anonymous

2007-07-30 21:52:15 · 2 answers · asked by Anonymous

2007-07-30 21:46:04 · 2 answers · asked by Anonymous

how exactly does astatine and francium bond? what type of bond is it?

2007-07-30 21:45:47 · 3 answers · asked by Anonymous

Ammonium nitrate is an oxidizer which is used for exposives, cause i guess the more oxygen theres in a fire the bigger the fire. Well, is there any chemical that can take oxygen away. Like maybe creating a bomb that takes away all oxygen from area it explodes.

2007-07-30 21:23:21 · 1 answers · asked by Anonymous

Energy released by the process in which isolated gas phase ions come together to form a solid, crystalline, ionic compound is called.....?

2007-07-30 21:13:26 · 2 answers · asked by ~daweed~ 3

2007-07-30 21:12:03 · 1 answers · asked by ~daweed~ 3

Why is the Predicted ground state and Observed ground state of some elements different?

For example, The PGS of Chromium is: 1s2 2s2 2p6 3s2 3p6 4s2 3d1 3d1 3d1 3d1 3d0.

On the other hand, the OGS is 1s2 2s2 2p6 3s2 3p6 4s1 3d1 3d1 3d1 3d1 3d1.

The PGS has 4s2 and 3d0, while the OGS has 4s1 and 3d1.

Why is that?

2007-07-30 21:02:56 · 1 answers · asked by cute_pierre 1

2007-07-30 20:59:31 · 2 answers · asked by ~daweed~ 3

2007-07-30 20:36:16 · 1 answers · asked by Denise 1

a type of electrolyte is enough to convert chemical energy into electrical energy. but why we separate it like in daniel cell

2007-07-30 20:16:48 · 1 answers · asked by Anonymous

A) 90 degrees
B) 109.5 degrees
C) 120degrees
D) 180 degrees
E) 60 degrees

2007-07-30 20:16:37 · 2 answers · asked by ~daweed~ 3

If you isolated 0.57 g of calcium phosphate, calculate the percent phosphate in a 50 g sample of milk.

2007-07-30 18:56:05 · 2 answers · asked by Allie 2

process

2007-07-30 18:34:07 · 1 answers · asked by poonam 1

Hello!
I have an unknown compound of simple salt that contains one cation and one anion. Possible cations include silver, lead, bismuth, tin, aluminum, zinc and antimony. Possible anions include chloride, bromide, Iodine, sulfate, sulfide, sulfite, nitrate, phosphate, and colbalt. I try to dissolve the unknown compound into the following solution.

In H2O: insoluble even with stirring and heating
In HCl: insoluble after stirring and heating
In HNO3: soluble after stirring and heating
In NaOH: soluble after upon adding into 6 M NaOH
IN NH3: soluble after adding, and complete soluble after stir and wait.

I think it's silver chloride. Any idea?

2007-07-30 16:35:06 · 1 answers · asked by Alan l 1

Can someone explain step by step how to do these 2 questions? Thanks.



If we assume standard conditions, the minimum potential difference required to electrolyze a solution of nickel II sulfate is?

ans: 1.49V

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In the plating of nickel from a nickel II ion solution the mass of nickel obtained from the transfer of 0.250 mol of electrons is?

ans: 7.34g

2007-07-30 15:14:16 · 1 answers · asked by Anonymous

In determining the density of an unknown solid, it was immersed in water. If a portion of the sample sticks out of the water, how will this effect the calculation of the density?

2007-07-30 15:08:35 · 1 answers · asked by crown_hustle 1