Kathy has been exercising vigorously for the past half hour. her body feels sore and she feels pain in her limbs. what could be the reason for this? select one of the options below as your
a. accumulation of lactic acid in the muscles of her limbs
b. accumulation of alcohol in the muscles of her limbs
c. accumulation of co2 in the muscles of her limbs

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