(3) Small quantities of hydrogen gas can be prepared in the laboratory by the addition of aqueous hydrochloric acid to m

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3 Small Quantities Of Hydrogen Gas Can Be Prepared In The Laboratory By The Addition Of Aqueous Hydrochloric Acid To M 1 (82.91 KiB) Viewed 73 times

(3) Small quantities of hydrogen gas can be prepared in the laboratory by the addition of aqueous hydrochloric acid to metallic zinc. Zn (s) + 2HCl(aq) ZnCl(aq) + Hz) Typically, the hydrogen gas is bubbled through water for collection and becomes saturated with water vapor. Suppose 240.0 ml of hydrogen gas is collected at 30°C and has a total pressure reading of 1.032 atm by this process. a) What is the partial pressure of hydrogen gas in this sample? (The vapor pressure of water at this temperature equals to 0.042 atm) b) Calculate how many moles of Hydrogen was produced? R=0.08206 L.atm/mol.K c) How many grams of Zn must have reacted to produce this quantity of hydrogen gas? (Molar mass of Zn = 65.4 g/mol)