Which choice represents a pair of resonance structures? view available hint(s) which choice represents a pair of resonance structures? a. n⋅⋅≡c−s−h and n⋅⋅≡c−s: − : b. o⋅⋅=n⋅⋅−f: and : n⋅=o⋅⋅⋅−f: c. h−h and : i−i: d. o−s⋅⋅⋅=o⋅⋅: and : o⋅⋅=s⋅⋅⋅−o:

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