A hydrogen gas sample was collected over water. The volume of the sample was 190.0 mL at 26° C with a pressure in the room of 754 mm Hg. (The vapor pressure of water at 26° C is 25.2 mm Hg.)
a. Calculate the number of moles of hydrogen in the sample.
b. Calculate how many molecules of water vapor are present in the sample.
c. Determine the density of the gas mixture in g/L.
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Displacement is the slope of a velocity vs. time graph a. true b. false

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