(Chemistry 1) Empirical Formula Overboard
Q in the comments (need the solving way)

Question

(Chemistry 1) Empirical Formula Overboard 
Q in the comments (need the solving way)

gelphielvr · Answer

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gelphielvr · Answer

Okay so I figured out D1 already and D2 but idk anything about D3

gelphielvr · Answer

Okay nevermind - D2 is not solved yet. if anyone knows the answer pls just tell me 
I don't even need the solving way

Luigi0210 · Answer

I'm going to assume it's the general steps for all 3 problems, so here they are:

$\large 1$. Assume 100 g of substance

$\large 2 $. Convert everything to moles

$\large 3$. Divide by the smallest ratio.

$\large 4$. Clear any fractions to whole numbers

If you want, I can show ya on Substance 3?

gelphielvr · Answer

for D2 I have 
15.87g = 1.3213mol C

2.22g = 2.1980mol H

18.15g = 1.2955mol N

63.41g = 3.9631mol O

I just don't know how to divide it correctly and how to round

gelphielvr · Answer

@gelphielvr wrote:

for D2 I have 15.87g = 1.3213mol C 2.22g = 2.1980mol H 18.15g = 1.2955mol N 63.41g = 3.9631mol O I just don't know how to divide it correctly and how to round

like I know I have to divide it by the smallest number but I don't know how to round it correctly

Luigi0210 · Answer

I would suggest (unless your teacher specifically says), only use 2 significant figures, it makes things easier, so:

C: 1.32 moles
H: 2.20 moles
N: 1.30 moles
O: 3.96 moles

But now, just divide it by the smallest number, which would be 1.30

C: ~ 1.02
H: ~ 1.69 
N: ~ 1.00
O: ~ 3.05

Now to get whole numbers, just multiply it by 3:

C: ~ 3
H: ~ 5
N: ~ 3
O: ~ 9

So formula:

$\Large C_3 H_5 N_3 O_9 $

If I did it correctly ofc lol

gelphielvr · Answer

@luigi0210 wrote:

I would suggest (unless your teacher specifically says), only use 2 significant figures, it makes things easier, so: C: 1.32 moles H: 2.20 moles N: 1.30 moles O: 3.96 moles But now, just divide it by the smallest number, which would be 1.30 C: ~ 1.02 H: ~ 1.69 N: ~ 1.00 O: ~ 3.05 Now to get whole numbers, just multiply it by 3: C: ~ 3 H: ~ 5 N: ~ 3 O: ~ 9 So formula: $\Large C_3 H_5 N_3 O_9 $ If I did it correctly ofc lol

unfortunately our teacher told us to use thousands (idk why) but yes this is correct!! thank you so so much I really appreciate it

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