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harlz_chalamet
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#1
hey guys!
i was doing a moles question and one of the steps i needed to do was find out the moles of chlorine so i needed to find the Mr of chlorine.
i ended up finding Cl2 which was 71
however, i was meant to find just Cl which is 31.5
when the question states 'chlorine', do i automatically have to know that they are asking for the chlorine atom because i've always thought that i had to find the molecule Cl2 instead.
for a bit of context, this is the question (Question 8.6):
https://filestore.aqa.org.uk/sample-...H-QP-NOV20.PDF
thankyou
i was doing a moles question and one of the steps i needed to do was find out the moles of chlorine so i needed to find the Mr of chlorine.
i ended up finding Cl2 which was 71
however, i was meant to find just Cl which is 31.5
when the question states 'chlorine', do i automatically have to know that they are asking for the chlorine atom because i've always thought that i had to find the molecule Cl2 instead.
for a bit of context, this is the question (Question 8.6):
https://filestore.aqa.org.uk/sample-...H-QP-NOV20.PDF
thankyou
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luana35
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#2
This question is asking for a mole ratio, so when you're doing calculations using chlorine atoms (Cl2) you use the Mr of two atoms, but since its asking for the mole ratio, its a bit different as a ratio is just comparing the moles of the iron (i think) and the chlorine, so you need to give the moles using the Mr of just 35.5. i hope that's helpful.
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scimus63
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the examples at the end of this page show you how to do this
https://science-revision.co.uk/moles...20formula.html
https://science-revision.co.uk/moles...20formula.html
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