Question

What is the mass of phosphorus in a 43-kg person? The mass of phosphorus is 0.78kg

Answer 1

Is that a question then an answer? What is it that you need help with?

Answer 2

I think you need to know the percent phosphorous (by mass) of the person.

Answer 3

No the question is what is the mass of phosphorus in a 43-kg person and then there's a diagram that says phosphorus is 0.78 kg so I don't know @JoannaBlackwelder

Answer 4

Hmm, can you post the diagram by chance?

Answer 5

It's this one @JoannaBlackwelder

Answer 6

Oh, ok. We are given the mass of phosphorous in a 70kg person. That would not be the same mass as in a 43kg person, but it would be the same percent!

Answer 7

Can you find the percent of phosphorous in the 70 kg person?

Answer 8

Yeah I did that and got 0.0111... but that's not the correct answer

Answer 9

That's not the answer though. That's just an intermediary step. :)

Answer 10

Now that you have found the fraction of phosphorous in the body, you can multiply it be the mass of the 43 kg person to find the mass of phosphorous in his body.

Answer 11

*by

Answer 12

I did that and got 20.6 but it's still not it

Answer 13

That's not what I got.

Answer 14

0.011428...*43=0.47914...

Answer 15

Or 0.48 kg rounded to 2 sig figs

Answer 16

Ahh that's right I was doing it wrong the whole time smh! Lo thanks so much (:

Answer 17

No worries :)

Answer 18

Welcome to Open Study!

Answer 19

Thank You!

Answer 20

:)