Compare the effusion rate of O2 and CO2 gas; which one is faster and by how much? 3. What is the total pressure in a scuba tank containing 225 KPa of O2 and 55 KPa of N2 and 22 KPa of He gases-
4. The atmosphere consists mostly of N2, O2, and Ar gases. If atmospheric pressure is 101 KPa at Aztec then find O2 pressure if N2 is 80.8 KPa and Ar is 1.0 KPa-

it's c. elements are placed in rows based on how may valencies electrons have.

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