12. A vessel with an intemal volume of 11.6 L contains 2.80 g of nitrogen gas, 0.403 g of hydrogen gas, and 79.9 g of argon gas. what is the pressure (in atm) inside the vessel at 25 °C?
a. 652 atm
b. 0.407 atm
c. 4.85 atm
d. 0.206 atm
e. 175 atm

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