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Identifying unknown metal

0.0054g of an unknown metal X reacts with an excess of sulfuric acid to form 72cm3 of H2
the equation is 2X+3H2SO4=X2(SO4)3 +3H2
identify metal x

Thanks in advance
Reply 1
Avatar for Pigster
Pigster
20
What have you tried so far?
It's probably prog metal if you can't tell what it is easily.
Reply 3
Avatar for fghfhg
fghfhg
OP
5
Original post by Pigster
What have you tried so far?



converted cm3 into dm3 to get 0.0072dm3then used molar gas volume equation , so 0.0072/24 is 0.003 mol then used mass given to find Mr then got 18 but there is no element with Mr of 18
Look at your equation.
Look at the ratios.
See what you can find :ninja:
Original post by fghfhg
converted cm3 into dm3 to get 0.0072dm3then used molar gas volume equation , so 0.0072/24 is 0.003 mol then used mass given to find Mr then got 18 but there is no element with Mr of 18
Reply 5
Avatar for fghfhg
fghfhg
OP
5
Original post by CheeseIsVeg
Look at your equation.
Look at the ratios.
See what you can find :ninja:


i got it its alright
:hugs: Nice one! Have a great afternoon!
Original post by fghfhg
i got it its alright
Reply 7
Avatar for fghfhg
fghfhg
OP
5
Original post by CheeseIsVeg
:hugs: Nice one! Have a great afternoon!


thanks you too
Reply 8
Avatar for Ali2486
Ali2486
2
What equation do you use because I thought you could only use molar Gas equation at room temperature and pressure
Original post by Ali2486
What equation do you use because I thought you could only use molar Gas equation at room temperature and pressure

So you use molar gas equation. What I did was:

divide the 72cm^3 by 24000= 72/24000= 3x10^-3
Then you divide that by 1.5 (2x10^-3), because of the 3:2 ratio of 3H2:2X
You then use that answer (2x10^-3), and substitute into Mr=mass/mol
So you get Mr=0.054/2x10^-3=27 Cobalt

That's what I got. Hope it helps...

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