Stuck on this question watch

1. Determine the phosphurous content of a 70kg man if it is know than the human body contains 6.3x10^3ppm phosphorous

any ideas, thanks
2. anyone
3. 70 / 1000000 = 7x10^-5
(7x10^-5) x (6.3x10^3) = 0.441 kg or 441 grams ...i think

...you divide 70 into a million parts and then 6.3x10^3 of those parts are occupied by phosphorus..

i hope you get more replies though, cos i'm not completely sure..
4. (Original post by memomemootoo)
70 / 1000000 = 7x10^-5
(7x10^-5) x (6.3x10^3) = 0.441 kg or 441 grams ...i think

...you divide 70 into a million parts and then 6.3x10^3 of those parts are occupied by phosphorus..

i hope you get more replies though, cos i'm not completely sure..
ah i was thinking the other way, was gonna turn 6300ppm into kg, once uve found the weight of the phosphorus put it over the 70kg but im struggling to turn ppm into some sort of weight
5. (Original post by Soloman)
ah i was thinking the other way, was gonna turn 6300ppm into kg, once uve found the weight of the phosphorus put it over the 70kg but im struggling to turn ppm into some sort of weight
yeah, i don't think you can turn ppm straight into kg ...because it's all in proportions

..think of it as how you would do a percentage:
eg ~find amount of water in a 50kg man if his water content is 20% (same as 20 parts per hundred)~
..so you divide 50 by 100 and then multiply by 20 to get the mass of water

so in the same way you divide 70 by 1 million and then multiply by 6300
6. (Original post by memomemootoo)
yeah, i don't think you can turn ppm straight into kg ...because it's all in proportions

..think of it as how you would do a percentage:
eg ~find amount of water in a 50kg man if his water content is 20% (same as 20 parts per hundred)~
..so you divide 50 by 100 and then multiply by 20 to get the mass of water

so in the same way you divide 70 by 1 million and then multiply by 6300
Okay so ur way is most prob right, well better than the way i was gonna do it
thanks

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