Multiple choice

A $5$ mole mixture of $H_2(g), O_2(g) $ and $He(g)$ are placed together in a closed container at pressure equal to $50 atm$. An electric spark is passed and pressure is noted as $20atm$ after cooling the content to original temperature.Oxygen gas is further introduced to increase the pressure to $50 atm$, keeping volume and temperature constant. Again electric spark is passed and pressure drops to $35atm$ under original temperature condition. Select the incorrect statement.

  1. Total mass of mixture is $42g$
  2. Mass of $O_2$ introduced in between the process is more than the initial mass of $O_2$ in the mixture.
  3. Mole fraction of $O_2$ in final mixture is more than mole fraction of $O_2$ in initial mixture.
  4. Mass of Helium is $2g$ and remain constant in the process
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