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A gaseous mixture containing 20 moles of nitrogen, 10 moles of oxygen and 5 moles of methane exerts a total pressure of 10 atm. What is the partial pressure of the nitrogen?
a. 0.148 atm
b. 1.67 atm
c. 3.99 atm
d. 5.71 atm
e. 8.90 atm
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