The partial pressure of helium is 0.54 atm.
What is the partial pressure?
We know that when we have a mixture of gases, each of the gases do individually exert a pressure on the walls of the container. The individual pressure that is exerted on the walls of the container is whet we have called the partial pressure of the gas.
We have to find;
Number of moles of carbon dioxide = 25.0 g/44 g/mol
= 0.57 moles
Number of moles of helium gas = 3.75 g/4 g/mol
= 0.94 moles
Total number of moles = 0.57 moles + 0.94 moles
= 1.51
Partial pressure of helium = Mole fraction of helium * total pressure
= 0.94/1.51 * 0.875
= 0.54 atm
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