Question

@surry99

Answer 1

Are you aware of Avagadro's number?

Answer 2

No...I don't think so

Answer 3

ok, take a second and look it up and I will help you.

Answer 4

do i multiply 2.1 by 6.0221 x 10^23?

Answer 5

yes but the question is why?

Answer 6

i'm not sure...

Answer 7

ok, Avagadros number tells you the number of anything per mole.
So for example if you a mole of pennies ...you have 6.02 * 10^23 pennies
if you have a mole of pens...you have 6.02 * 10^23 pens
so Avagadros number is like the term dozen.... a dozen of anything is 12

So in your problem you have 2.10 moles of C02 so:

2.10 moles of C02 * 6.02* 10^23 molecules/ mole of CO2 = number of molecules of C02

Answer 8

gotta run now...TTYL

Answer 9

i'm confused. What's the mole of CO2? i divide 2.1 times60.2 x 10^23 by that, right?

Answer 10

no... you are multiplying, I am just putting units in.

2.10 moles of C02 * 6.02* 10^23 molecules of CO2/ mole of CO2 = ? number of molecules of C02

you see the moles of CO2 cancel out...it is in the numerator in the first term and denominator in the second term. By writing the units in, you can see your final answer is in the correct units...which is molecules of C02

Answer 11

Oh. Thank you.