So basically what I did was, I divided 200 by 1000 then multiplied it by 100. I got 20%, and I then multiplied it by 10,000 and got 200000 ppm. I checked the mark scheme and it says that it's 200 ppm or 2 x 10^2. Why's that?
So basically what I did was, I divided 200 by 1000 then multiplied it by 100. I got 20%, and I then multiplied it by 10,000 and got 200000 ppm. I checked the mark scheme and it says that it's 200 ppm or 2 x 10^2. Why's that?
ppm means grams per million grams
if you have 1000g you must multiply this by 1000 to get 1000,000 grams
if you have 1000g you must multiply this by 1000 to get 1000,000 grams
You do the same to the 200mg
200 mg x 1000 = 200g
hence you have 200g per 1000000g = 200 ppm
I still don't get it?! Why would I have to convert 1000g if it's already in grams? And, why don't I divide the 200 by 1000, they're both masses and if I divided them I'd get a concentration. Isn't mg/g equal to a concentration?
I still don't get it?! Why would I have to convert 1000g if it's already in grams? And, why don't I divide the 200 by 1000, they're both masses and if I divided them I'd get a concentration. Isn't mg/g equal to a concentration?
I honestly didn't understand. Could you please explain it again, but a bit simpler?!
Seems this got a bit muddled. You've got 0.2g of Methanol in 1000g of blood. So that's 0.2 ppt, and in order to get it in ppm, just multiply by 1000, so 0.2*1000 = 200 ppm.
Seems what you did the first time was forget to convert the mg into g, hence the factor of 103 out.
Seems this got a bit muddled. You've got 0.2g of Methanol in 1000g of blood. So that's 0.2 ppt, and in order to get it in ppm, just multiply by 1000, so 0.2*1000 = 200 ppm.
Seems what you did the first time was forget to convert the mg into g, hence the factor of 103 out.