A scuba tank is being prepared for a deep sea dive 9 atms of He, 1.5 atms of Nitrogen gas and 6 atms of oxygen gas are added to the tank. What is the total pressure?

9+6+1.5 =16.5atm

Explanation:

total pressure is equal to the sum of the partial pressures.

P(He) + P(N2) + P(O2) =P(Total)

9atm + 1.5atm + 6atm = 16.5 atm

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just did the assignment and the answer was #1 +2 n