# A vessel contains a mixture of nitrogen and oxygen. If the partial pressure of nitrogen is 20 atmospheres and the partial pressure of oxygen is 42.8 atmospheres, what is the total pressure inside the vessel?

${P}_{\text{Total}} = \left(20 + 42.8\right) \cdot a t m = 62.8 \cdot a t m$
For your problem ${P}_{\text{Total"=P_"dinitrogen"+P_"dioxygen}}$ $=$ $\left(20 + 42.8\right) \cdot a t m$.