Can someone please answer this question

Question

A steel tank contains a mixture of Ar and He gases. The total pressure in the tank is 4818 mmHg. If the partial pressure of helium in the tank is 1653 mmHg, what is the partial pressure of argon in atm? 

Answer 1

Answer 2

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The tank only contains two gases, Ar and He.

Pressure tot = Partial Pressure Ar + Partial Pressure He

Partial Pressure Ar = Pressure total - Partial Pressure He = 4818 mmHg -1653 mmHg = 3165 mmHg Ar

Pressure of Ar in atm = 3165 mmHg Ar * 1 atm/ 760 mmHg = 4.164 atm Ar