Ok I am in AP Chemistry 2 and I have no clue what I am doing... so can someone help me with this problem??

Hexamethylenetetramine was used for the treatment of kidney and bladder infections prior to the development of modern antibiotic drugs. Combustion of 0.2897 g of this compound produced 0.5456 g of CO2 and ).2234 g of H2O. Separate nitrogen assay of a 0.3801 g sample yielded 0.1848 g of ammonia. What is the empirical formula of this compound?

I have a few questions for the electrolysis of water.

If 4 Litres of water is used and lets say for example a 9 volt battery is used. How much hydrogen and oxygen will be produced per second in terms of molecules?

Also if salt is added to the water to speed up the process, how much salt would be needed and would the products from the electrolysis change?

Please answer
Thank you

The units of resistivity don't come out right.

10^-8 Ohm * m
or
m Ohm * cm

the 'm' should be a 'mu', but unfortunately they both look the same in the latin alphabet.

I've translated the contents of hydrogenium and helium into simplified Chinese from your site but not published on anywhere. I want to get the permission from the author in order to submit it on the Internet. Could I?
You can download the attachment, but you should change the extension into ".zip" before you open it.

The address of the attachment:
http://www.webelements.com/nexus/files/001、H.pdf

Many agree that replacing conventional petrol driven cars with hydrogen is a good idea provided the hydrogen does not originate in a process involving oil as the only product from hydrogen burning is water, rather than carbon dioxide.

However the road to hydrogen-powered vehicles will not be easy, industry experts state. Representatives of European and American car and energy companies at the National Hydrogen Association convention said hydrogen technology is feasible, but faces big challenges to become commercially viable.

Researchers at the Carnegie Institution of Washington (Washington DC, USA) have managed to make a remarkable alloy of hydrogen and oxygen from water! They used X-rays to dissociate water at high pressure to form a solid mixture, that is, an alloy, of molecular oxygen (O₂) and molecular hydrogen (H₂).

The researchers placed some water under an extremely high pressure, about 170,000 atmospheres (17 Gigapascals), using a diamond anvil and then beamed high-energy X-rays at the water. Nearly all the water molecules split and reformed as a solid alloy of O₂ and H₂. The X-rays are key to cleaving the O—H bonds in water. Without it, the water remains as a high-pressure form of ice known as ice VII. Ice VII is one of at least 15 kinds of ice that exist under various high pressure and variable temperature conditions.

The Group 1 elements other than hydrogen are called the alkali metals. The Group 1 elements are:

• Hydrogen
• Lithium
• Sodium
• Potassium
• Rubidium
• Caesium
• Francium

The Group 1 metals are all highly reactive silvery metals that are so reactive to air and moisture that they must be stored under an inert atmosphere or oil. They are all soft and can be cut easily with a knife.

Hydrogen is usually placed at the top of the Group but is not a Group 1 metal.

The electronic configuration of the elements all consist of a lone s-electron outside an inner core of electron corresponding to the previous inert gas.

That old truism about mixing oil and water can apply to water and water, according to researchers at Pacific Northwest National Laboratory in Washington State.

Read about his and more in the latest issue of Reactive Reports chemistry news

I've taken the liberty of reproducing a CHMED-L post from Eric Scerri about hydrogen's position in the periodic table.

The position of hydrogen in the periodic system is a much debated topic. Authors have suggested groups I, VII and even IV over the years. Others opt from removing H from the main body of the table, along with He. The official journal of IUPAC, called Chemistry International, has been running some articles and comments on this issue.

See http://iupac.org/publications/ci/2003/2506/ud.html for an article by Peter Atkins and Herb Kaesz suggesting that H should be removed from the main body of the table. See also http://iupac.org/publications/ci/2004/2603/ud2_scerri.html for a criticism of this view. Any comments from list members ?

regards, Eric Scerri

The Science Blog reports here that researchers at Penn State in the USA are developing self-cleaning titania nanotube hydrogen sensors. The hydrogen sensors are titania nanotubes coated with a discontinuous layer of palladium.

"The photocatalytic properties of titania nanotubes are so large - a factor of 100 times greater than any other form of titania - that sensor contaminants are efficiently removed with exposure to ultraviolet light, so that the sensors effectively recover or retain their original hydrogen sensitivity in real world application"

"The photocatalytic properties of titania nanotubes are so large - a factor of 100 times greater than any other form of titania - that sensor contaminants are efficiently removed with exposure to ultraviolet light, so that the sensors effectively recover or retain their original hydrogen sensitivity in real world application"

"By doping the titania nanotubes with trace amounts of different metals such as tin, gold, silver, copper, niobium and others, a wide variety of chemical sensors can be made.