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35.7 torr x (1 atm/760 torr) = 0.047 atm. Then, we can find the vapor pressure of the ethene by subtracting that number from the total vapor pressure of the gas produced: 0.822 atm (total vapor pressure) - 0.047 atm (water's vapor pressure) = 0.775 atm (ethene's vapor pressure)

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