Sometimes in lab we collect the gas formed by a chemical reaction over water. This makes it
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Sometimes in lab we collect the gas formed by a chemical reaction over water. This makes it easy to isolate and measure the amount of gas produced. Suppose the H2 gas evolved by a certain chemical reaction taking place at 35.0 C is collected over water, and the final volume of gas in the collection tube is measured to be 39.5 mL. Calculate the mass H2 that is in the collection tube.
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