Question

How many moles are in 5550 particles of sodium

Answer 1

\(n=\dfrac{N}{N_A}\)

n=moles, N=number of particles, \(N_A\)=avogadros number

Answer 2

why are you multiplying? just sub your values in

Answer 3

why are you subtracting?

Answer 4

\(n=\dfrac{5550}{6.022*10^{23}}\)

Answer 5

particles go on the top

Answer 6

thats not right

Answer 7

divide it

5500 divided by 6.022*10^23

Answer 8

okay, 5550 divided by 6.022*10^23

Answer 9

I am doing 5550 over 6.02 times 10^23

Answer 10

the exponent is -ve as in \(9.21*10^{-25}\)

Answer 11

Ohh okay 9.21 * 10^-25

Answer 12

That is ansewer

Answer 13

yup

Answer 14

Can you help with 1 pr 2 more please

Answer 15

The mass of 763 mole sodium chloride formula units NaCl is

Answer 16

use the same formula, solve for mass this time

Answer 17

Is is 763 times 6.02 * 10^23

Answer 18

Divide by mass of nacl

Answer 19

yeah, no division though

Answer 20

yeah looks good

Answer 21

Is it 4.00*10^-4 times by 6.02 *10^23
Divide by 70.906

Answer 22

yep

Answer 23

So it is 3.39 * 10^18

Answer 24

3.3960454*10^18

Answer 25

i don't know i'm not doing the arithmetic, myself.

Answer 26

Can you do it and tell me if this is right

Answer 27

yep it's right

Answer 28

So is it 3.39*10^18 or is it 3.40 *10^18 pr does not matter

Answer 29

Does it matter

Answer 30

it depends if they want a specific number of sig figs