The total pressure of a mixture of three gases in container is 3,345 mmhg. gas #1 has a pressure of 988 mmhg and gas #2 has a pressure of 1289 mmhg. what is the pressure of gas #3?

According to Dalton's law of partial pressure: The pressure exerted by a mixture of gases is sum partial pressure of each gas exert on the container.

Here we have mixture of three gases so the total pressure of three gases will be sum of their individual or partial pressures

Therefore the partial pressure of third gas will be

The pressure of gas#3 is 1068mmHg

b) nuclear ive learned that in a pedtrodic table

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