Angelika

thanks, but I must be really thick as I don't know how to express a gas in a formula.

I need the molecular formula of oxide of arsenic when it is in its gaseous state and I need to show how I got there. Please help.

Hi, can you show me how to prepare dry hydrogen using the usual apparatus.

Hi, I am asked to prepare a sample of the gas hydrogen selenide with various matrials and equipment. I have an idea how to go about it but need comfirmation. I also need a description of th experiment, so I need the right scientific jorgan. Please help