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Component Mass in Final State

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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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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 Celcius and 100 kPa consisting of 79% Nitrogen and 21% Oxygen on a molar basis. Helium at 21 degrees Celcius is allowed to flow into the vessel until the pressure is ...

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here is my revisions please let me know if this is better, on problem 3 our professor said to ignore presenting data, we just need to do a flow chart but I'm still confused about what I'm missing or the corrected one is better, I didnt the unknowns part i did the knowns portion of lab, we were told what what we started with we had to determine it from melting points so if you could please tell me what I'm missing from that specific flow chart?!

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