Which sample of methanol has particles with the highest average kinetic energy?
O A) 10.0 mL of ethanol at 35°C
B) 10.0 mL of ethanol at 75°C
O C) 100.0 mL of ethanol at 55°C
D) 100.0 mL of ethanol at 65°C

the answer is 75.0%.

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