The reaction 2c2h6 + 7o2 yields 4co2 + 6h2o has a ratio of 2 parts ethane (c2h6) and 7 parts oxygen (o2). how many parts ethane (c2h6) will be needed to react with 21 parts of oxygen (o2)? show your work.

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