Deduce Total Pressure on Mixing of Gases
When we have a few gases at different volumes and pressures, it is less straight forward to find the final pressure.
We can start with summing up the number of moles, since we know that the moles of gases in bulbs R and S will add up to the total moles of gas in the final mixture.
We can use the ideal gas equation and write the terms in terms of moles.
We can then substitute moles of R, S and total moles in terms of pressure, volume, gas constant R and temperature.
Since R and temperature are constant, these terms can cancel to give an expression in terms of pressure and volume.
We can then determine total pressure to be 125 kPa.
Hence answer to this question is option D.
We can memorise the following formula to determine final pressure when 2 gases with different pressure and volume are mixed together under constant temperature.
Topic: Gaseous State, Physical Chemistry, A Level Chemistry, Singapore
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