If the partial pressure of hydrogen in the mixture is 75 torr, the total pressure of the mixture is 100 torr.
What is partial pressure?
Partial pressure is the notional pressure present in every gas.
Given,
The mole fraction of helium is 0.750.
The partial pressure of hydrogen in the mixture is 75 torr
The mole fraction of hydrogen is
To find the total pressure
By Roult's law
Partial pressures divided by mole fraction
75 / 0.750 = 100 torr
Thus, the correct option is a, 100 torr.
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