Question

chem Q w/ algebra calculation;
I think I got this wrong.

http://prntscr.com/cl4d7p

I don't get why only half of it was incorrect? :\

Answer 1

example of the process I went through:
https://answers.yahoo.com/question/index?qid=20100813185945AA8O0A2

(Different values but similar idea)

Answer 2

Oooooooh, i get it

Answer 3

o_o?

Answer 4

yeah yeah, you just uh, uhm... erm.... ah; RIGHT, you uh, you do that thing, and uh... add the one thing... and.... er... yah.
And that is how it's done

Answer 5

Sorry, I tried to help and failed.

Answer 6

( ͡° ͜ʖ ͡°)

Answer 7

... uh... okay?

Answer 8

@mathmale May I request assistance in algebraic calculation?

Answer 9

I repeat my calculation and replace the value of mass of iron by 55.845 in place of 55.847

my new values are 18.63% Al and 81.37% for Fe

\[mass.of Al = \frac{ \frac{ 0.100gH _{2} }{2.016 g H _{2}} -\frac{ 1.99g- sample }{AtomicMass Fe}}{ \frac{ 3 }{ 2 \times Atomic Mass Al }- \frac{ 1 }{ Atomic Mass Fe }}=0.37066 g\]

Answer 10

@cuanchi The site says my first value of 80.90% is CORRECT. But the other percentage is not... I don't get that. :(

Answer 11

@jabez177

Answer 12

@Mathmale, may you please teach this person how to do this? :)
You are great at that. :)

Answer 13

I actually asked him, but he disappeared on me.

Answer 14

No idea

Answer 15

@jim_thompson5910 May you help with this problem, please? :) I'm asking kindly. :-)

Answer 16

@agent0smith @inkyvoyd

Answer 17

@kittiwitti1 I'm not that great with chem, but I notice that it mentions something about sig figs. So maybe instead of 19.10 you would put in 19.1 ? Maybe the same applies with 89.90 ?

Answer 18

@kittiwitti1 yes just try 3SF