What is the average mass of a single chlorine atom in grams?
Answers I tried and failed:
70
2.13x10^25
5.88x10^23
1.178x10^-22
2.13x10^-21

m = 5.81x10-²³ g Cl

Explanation: First is to find the number of moles of Cl in 1 atom of Chlorine. To solve this we will use the Avogadro's Number to convert atoms to moles.

1 atom Cl x 1 mole Cl / 6.022x10²³ atoms Cl

= 1.66x10-²⁴ moles Cl

The next step is to convert the moles of Cl to mass using its molar mass.

1.66x10-²⁴ moles Cl x 35 g Cl / 1 mole Cl

= 5.81x10-²³ g Cl.

Cancel out the units of moles Cl.

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally