1- Is there a difference between the TLC of the crude and recrystallized in terms of Z/E products? 2- Even though a 1H NMR was not obtained for your product, propose how you could distinguish Z-Stilbene from E-Stilbene using 1H NMR.

i have a feeling this is a gay person trolling to make straights look bad.

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