[mattgad2006]

Hi All,

I did an experiment to determine the RAM of lithium using 0.12g of lithium, by measuring the hydrogen produced when it reacted with water.

222cm³ of H₂ was given off.

Assuming 1 mole of gas occupies 24000cm³ at room temperature and pressure, I have worked out that the number of moles of hydrogen collected was 0.00925 moles and that the moles of Li that reacted is 0.01731913043. Are these calculations correct?

How do I use this information to calculate the relative atomic mass of lithium?

The equation for the reaction is: 2Li(s) + 2H2O(l) --> 2LiOH(aq) + H2(g)

Thanks.

[Alberto_Kravina]

I think you are correct!

1 mole ----> 24000 cm³
x moles -----> 222 cm³

X=(1*222)/(24000)
X = 0.00925 moles

[mattgad2006]

Thanks, am I also correct for the moles of Li?

[xiankai]

how did u arrive at that number? all u got to do is multiply moles of hydrogen by 2 according to the mole ratio, why are there so many digits?