Sharon asks…
What temperature would i have to cool hydrogen gas to turn it into liguid?
I am building an hho generator which produces hydrogen gas and oxygen from water. I want to turn the hydrogen to a liquid state and seperate it from the oxygen. I know from basic chemistry that any gas can be turned to a liquid by bringing either the temperature or pressure to a certain level. I could easily bring the temperature to an extremely low level by using a certain device but I was wondering what exactly the temperature would need to be. Also, is the another way of converting hydrogen gas to hydrogen liquid?
admin answers:
At normal pressure, the boiling point for hydrogen is -252.87 Celsius or 20.28 Kelvin or -434.45 Fahrenheit. You would have to cool to this temperature or below to liquefy it. Increasing the pressure, as you said, would allow you to liquefy the gas at a higher temperature.
Mary asks…
How many grams of hydrogen are needed to use up 80 grams of oxygen?
If you were to combine 80 g of oxygen with some hydrogen, how much hydrogen (in grams) would you need to completely use of all of the oxygen? (use factor labels).
This is a problem in my chem class. How can I solve this without knowing if it is supposed to be forming H20 or H2O2?
admin answers:
I really think the answer is meant to be regarding water – H20, since it works out so nicely its pretty much a mental arithmetic question.
As such i will answer in regards to water.
N = m / mr
n= number of moles
m = mass
mr = relative atomic mass
n = 80 / 16 = 5
since you need twice as much hydrogen as you do oxygen then you need twice as many moles i.e. 10 moles of hydrogen
rearrange the equation to get m = n x mr
m = 10 x 1 = 10g of hydrogen needed
Make a note of the fact that the question could have been regarding hydrogen peroxide though, i think your teacher will like that.
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