Equal masses of methane and oxygen are combined in an empty vessel at 250°C; the pressure fraction exerted by oxygen is___________________?
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Answer: C. one / three
Explanation
Equal masses of methane and oxygen are combined inside a rigid reaction vessel. Methane has a molar mass of sixteen grams, while oxygen has a molar mass of thirty-two. Calculating moles yields twice as much methane, making oxygen's pressure fraction one-third. Dalton's law states that total pressure equals the sum of individual partial pressures. Mole fractions directly determine the pressure fraction exerted by each gas in a mixture. Molar mass determines the number of moles present in equal mass sample weights.
Gas mixture calculations are essential for atmospheric science and combustion engineering. Partial pressure concepts help predict gas behavior in chemical manufacturing plants. Stoichiometry problems frequently require converting mass to moles for accuracy. One over seventeen ignores proper molar mass ratios between methane and oxygen. Sixteen over seventeen reverses the correct mole fraction calculations for the gases. Two over three represents the pressure fraction exerted by methane rather than oxygen.
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