stoichiometry homework key

# stoichiometry homework key - Exam IV SUMMER 2008 CHM 151IN...

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Exam IV SUMMER 2008 CHM 151IN NAME: ______________________key_________________________________________ 1. Write balanced chemical equations to correspond to each of the following descriptions: (15pts) (a) Solid calcium carbide, CaC 2 , reacts with water to form an aqueous solution of calcium hydroxide and acetylene gas, C 2 H 2 . (b) When solid potassium chlorate KClO 3 is heated, it decomposes to form solid potassium chloride and oxygen gas. (c) Solid zinc metal reacts with sulfuric acid H 3 PO 4 ( aq ), to form hydrogen gas and an aqueous solution of zinc (II) sulfate. (d) When liquid phosphorus trichloride is added to water, it reacts to form aqueous phosphorous acid, H 3 PO 3 ( aq ), and aqueous hydrochloric acid (HCl). (e) When hydrogen sulfide gas is passed over solid hot iron(III) hydroxide, the resultant reaction produces solid iron(III) sulfide and gaseous water 2. The molecular formula of allicin, the compound responsible for the characteristic smell of garlic, is C 6 H 10 OS 2 . (10pts) (a) What is the molar mass of allicin? 162 g/mol (b) How many moles of allicin are present in 5.00 mg of this substance?

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