If water with the mass of 18.0 grams is heated into water vapor in a closed system such as a closed glass jar, what is the mass of the gas after the water completely evaporates?

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One of the few xenon compounds that form is cesium xenon heptafluoride (csxef7). how many moles of csxef7 can be produced from the reaction of 13.0 mol cesium fluoride with 12.5 mol xenon hexafluoride? csf(s) + xef6(s) csxef7(s)

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