The pressure in tank X is greater than that in tank Y because the number of moles or mass of argon gas in Tank X is greater than the number of moles or mass of nitrogen gas in Tank Y.
What is the pressure of a gas?
The pressure of a gas is the force that molecules of the gas exert per unit area of the walls of their container due the collisions of the gas molecules with themselves and with the walls of their contain.
The pressure of a gas is related to the volume (V), temperature (T) and number of moles (n) of the gas by the formula:
where;
- R is molar gas constant
- n = mass/Molar mass.
Since volume, temperature and R is constant for the two gases, the pressure difference will be determined by the number of moles of each gas.
Number of moles of a gas is proportional to the mass of the gas present.
Therefore, the best explanation as to why the pressure in tank X is greater than that in tank Y is that the number of moles or mass of argon gas in Tank X is greater than the number of moles or mass of nitrogen gas in Tank Y.
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