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# OCR Equilirium question. watch

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1. Can anyone explain this question? I've been attempting it for a while and i don't understand why the values need to be multiplied by 5 and not divided by 2? Can someone xplain?
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2. (Original post by AqsaMx)
Can anyone explain this question? I've been attempting it for a while and i don't understand why the values need to be multiplied by 5 and not divided by 2? Can someone xplain?
Firstly, why do you think you are dividing by 2?

As for the multiplication by 5, I don't see how that fits in.
3. (Original post by RMNDK)
Firstly, why do you think you are dividing by 2?

As for the multiplication by 5, I don't see how that fits in.
The mark scheme says that you need to multiply by 5 which is what I don't understand. I thought that you divide the values by 2 as that's the volume but I may be wrong :|
4. (Original post by AqsaMx)
The mark scheme says that you need to multiply by 5 which is what I don't understand. I thought that you divide the values by 2 as that's the volume but I may be wrong :|

You're right. To get concentration you divide moles by volume.

But what's the units of volume?
Spoiler:
Show
dm3
The volume they give you is 200cm3
How do you convert that to the new units?

I really don't see why the multiplying by 5 is necessary..
5. (Original post by RMNDK)
You're right. To get concentration you divide moles by volume.

But what's the units of volume?
Spoiler:
Show
dm3
The volume they give you is 200cm3
How do you convert that to the new units?

I really don't see why the multiplying by 5 is necessary..
Ohh.. Oops. It's meant to be 0.2. Dividing by 0.2 and t.multiplying my five is equivalent so it makes sense now :3

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