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QUESTION

# How can I find partial pressure given moles?

is defined as the hypothetical pressure of a gas that is part of a mixture of gases that occupy a certain volume and a certain temperature, if that respective gas would occupy the same volum of the mixture, at the same temperature as the mixture.

Now, the fraction on an individual gas A that is a component of an ideal gas mixture can be expressed using either the moles of this component, or its

X_A = n_A/n_(TOTAL) = P_A/P_(TOTAL), where

n_A represents the number of moles of gas A present in the mixture; n_(TOTAL) represents the total number of moles present in the mixture; P_A represents A's partial pressure; P_(TOTAL) represents the total pressure of the gas mixture.

Therefore, a gas' partial pressure can be determined from its moles by knowing the total number of moles of the gaseous mixture and its total pressure

P_A = n_A/N_(TOTAL) * P_(TOTAL)

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