Question

Would this be 5.42 * 10^24

Answer 1

@Shadow @Vocaloid

Answer 2

did they give you a molar mass of carbon13?

Answer 3

they gavce me carbon12= 6.02*10^23

Answer 4

huh. strange.

molar mass of carbon-13 is 13.00335g/mol according to the internet

so you would just divide 9.000 by 13.00335 to get moles i think

Answer 5

i got 117

Answer 6

but its wrong when i punch it in

Answer 7

divide not multiply

Answer 8

9.000/13.00335

Answer 9

and yes I went in the hints and the mass is 13 so I did 1*9.00

Answer 10

13**

Answer 11

.621?

Answer 12

.692? ***

Answer 13

.692 should be it

Answer 14

Based on your answer in Part A, calculate the number of atoms in this amount of 13C?

Answer 15

oh

to go from moles to atoms just multiply the # of moles by 6.022e23

Answer 16

7.82 * `10^24

Answer 17

7.82?

we got 0.692 as the # of moles, right? so .692 * 6.022e23

Answer 18

oh okay I was doing 13 ...


4.17 * 10^23

Answer 19

good

Answer 20

Based on your answer in Part B, how many electrons are in this amount of 13C?

Answer 21

carbon 13 has 12 electrons so multiply the # of molecules by 12

Answer 22

156

Answer 23

4.17 * 10^23 is the number of molecules

so 12 * 4.17 * 10^23

Answer 24

5.0 * 10^24

Answer 25

5.00 * 10^24 since we have three sig figs

Answer 26

oh wait

Answer 27

carbon-13 has 6 electrons not 12 >>

so 6 * 4.17 * 10^23

Answer 28

2.50*10^24

Answer 29

good, lmk how that turns out

Answer 30

Based on your answer in Part B, how many neutrons are in this amount of 13C?,, 13 for this

Answer 31

each 13C atom has 7 neutrons

7 * 4.17 * 10^23

Answer 32

D?

Answer 33

hm, not quite, try going back to A or B and rechecking the calculation

Answer 34

b

Answer 35

good

Answer 36

.26?

Answer 37

they give you

1 carat = 0.20g

therefore 1.3 carat = 0.20 * 1.3grams

going from grams to moles, divide by the molar mass of carbon (which is about 12.011g/mol)

then multiply avogadro's # (6.022e23) to get atoms

Answer 38

hm I got something a little diff.

remember, 1 atom is tiny so you would expect a lot of atoms

Answer 39

.26*12.011

* 6.022*10^23=== 1.88*10^24

Answer 40

very close. after you get 0.26g, you need to divide by 12.011 not multiply

so (0.26/12.011)*6.022e23 should do it

Answer 41

1.30*10^22

Answer 42

only 2 sig figs so 1.3 * 10^22 not 1.30

Answer 43

Calculate the mass of 2.25×1022 tungsten atoms.


I would utilize do (2.25*10^22)*(6.022*10^23)

Answer 44

hm, close, since you have atoms and you want to go to moles, you would first divide by avogadro's number, then multiply by the molar mass

Answer 45

what would the atoms be?

Answer 46

so you are given 2.25×1022 tungsten atoms. according to the chart, divide by avogadro's number 6.022e23, and then from there, the chart says to multiply by the molar mass of Tungsten (get this from the ptable)

Answer 47

6.87

Answer 48

good

Answer 49

D

Answer 50

perfect