Hydrogen is collected over water at 25°C and 748 mm Hg in a 250-mL (3 significant figures) flask. The vapor pressure of water at 25°C is 23.8 mm Hg.
(a) What is the partial pressure of hydrogen?
(b) How many moles of water are in the flask?
(c) How many moles of dry gas are collected?
(d) If 0.0186 g of He are added to the flask at the same temperature, what is the partial pressure of helium in the flask?
(e) What is the total pressure in the flask after helium is added?
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