Question

How many atoms of carbon are needed to produce 0.45 mol Al?

3C + 2Al2O3 -----> 4Al + 3CO2

Answer 1

your equation is balanced

3 moles of C make 4 moles of Al

Answer 2

Hey there!

So from the equation we can see that 3 moles of carbon atoms are required to produce 4 moles of aluminium....ryt?

Answer 3

so, how many moles of C make one mole of Al?

Answer 4

Use unitary method to find that...

Answer 5

3C = 4Al

Al = ?C

Answer 6

0.3375 moles of carbon?

Answer 7

yeah, that step is coming up, but , first we need to know how many mole of C make one mole of Al

Answer 8

is it 2.6?

Answer 9

what?

Answer 10

2.6 moles of C make one mole of Al?

Answer 11

no, there should be less moles carbon than moles of aluminium

Answer 12

i have no idea :(

Answer 13

3C = 4Al

Al = (3/4)C

Answer 14

ok now what?

Answer 15

now

0.45 Al = ? C

Answer 16

0.3375 moles of carbon

Answer 17

yeah that's right

0.3375 moles of C make 0.45 moles of Al

Answer 18

so now you just need to convert 0.3375 moles into atoms,

use Avogadro's number \(N_A=6.022\times10^{23}[\text {molecules}/\text{mol}]\)

Answer 19

ok so i got 2.6 × 10^26 atoms

Answer 20

The number \(N\) of atoms (molecules) of a substance is equal tot the number of moles \(n\), times Avogadro's number \(N_A\)
\[N = nN_A\]

Answer 21

i'm so confused. what did you get?

Answer 22

\[N_\text C = n_\text CN_A\\
\ \ \quad= 0.3375[\text{mol}]\times 6.022\times10^{23}[\text{molecules/mol}]
\]

Answer 23

@UnkleRhaukus would the answer be 2.0 * 10^23 atoms

Answer 24

@Abhisar ?

Answer 25

that's right

Answer 26

thanks

Answer 27

@UnkleRhaukus can you help with one more?

Answer 28

i can