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Alevel chem help!!!!

The experiment was repeated and 0.73 g of magnesium was added to
150 cm3 of 0.50 mol dm−3 hydrochloric acid.
i) Calculate the number of moles of hydrochloric acid added.

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Reply 1
Avatar for FMohsin15
FMohsin15
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8
no that's why asking

Original post by Ensoetre
Have you not got the answer?
First of all, look at the stoichiometric ratio
and then look at the units, as you can see it’s in cm3 right? So what can you infer from this?
If you’ve read the book/examples then this calculation isn’t as hard as you think
Reply 5
Avatar for FMohsin15
FMohsin15
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convert into dm3 divide by 1000?

Original post by Tracheostenosis
and then look at the units, as you can see it’s in cm3 right? So what can you infer from this?
Original post by FMohsin15
convert into dm3 divide by 1000?



Correct
Reply 7
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FMohsin15
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now what do i do ?

Original post by Tracheostenosis
Correct
So for the moles of HCL, there’s an equation that you need to have in your back pocket
Which is why I said that you probably haven’t looked at the examples in the book
Reply 10
Avatar for FMohsin15
FMohsin15
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8
Thanks, I got its 0.15x0.50=0.075
Original post by FMohsin15
Thanks, I got its 0.15x0.50=0.075


Wait, that might be wrong
Reply 12
Avatar for FMohsin15
FMohsin15
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Do like helping me more or tried?

Original post by Tracheostenosis
Which is why I said that you probably haven’t looked at the examples in the book
Send me the full equation including stoichiometric ratios
Reply 14
Avatar for FMohsin15
FMohsin15
OP
8
Original post by Tracheostenosis
Wait, that might be wrong

What no!!! :frown:
You always have to be careful for the stoichiometric ratios, if you really want to get in that A category, I’m assuming you’re in Year 12?
Reply 16
Avatar for FMohsin15
FMohsin15
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8
Original post by Tracheostenosis
Send me the full equation including stoichiometric ratios

here
chem.PNG13.1KB
The answer is correct by the looks of it, because you haven’t really supplied me with context so I can’t say, but jut keep practicing:smile:
Reply 18
Avatar for FMohsin15
FMohsin15
OP
8
Original post by Tracheostenosis
You always have to be careful for the stoichiometric ratios, if you really want to get in that A category, I’m assuming you’re in Year 12?

yeah lol
Yeah it’s correct

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