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Component Mass in Final State

Please solve specific problem below rather than providing examples. A rigid vessel having a volume of 0.028m^3 initially contains a mixture at 21 degrees Celsius and 100 kPa consisting of 79% Nitrogen and 21% Oxygen on a molar basis. Helium at 21 degrees Celsius is allowed to flow into the vessel until the pressure is 136 kPa. If the final temperature of the mixture within the vessel is 21 degrees Celsius, determine the mass, in kg, of each component present in the final state. (assume the mixture and components all behave as ideal gases)

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