Methanol is produced when carbon monoxide and hydrogen gas react as follow:
1 molecule of carbon monoxide (CO) reacts with 2
molecules of hydrogen (H2) to produce some
amount of methanol (CH4O).
Considering the above reaction and based on the
Law of conservation of mass, how many atoms of
Hydrogen (H) are there in the products?

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