Please help ASAP. C3H8 + 5O2 ---> 4H2O + 3CO2 1. How many moles of oxygen gas are needed to react with excess propane (C3H8) in order to form 5.32 moles of water?
2. What mass of carbon dioxide is produced from 13 grams of oxygen gas and excess propane?
3. What mass of propane is needed in order to produce 2.70 moles of water?

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