StoichiometryProblems_ObiezeUdemadu.doc - NCVPS Honors...

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NCVPS Honors Chemistry Module 7, Lesson 1 Mastery Assignment Stoichiometry Conversions Homework M7L1M1 - Stoichiometry Conversions 1. If 35.2 g of hydrochloric acid react with excess of magnesium, how many grams of hydrogen are produced? Mg (s) + 2 HCl (aq) MgCl 2(aq) + H 2(aq) 0.964 moles of HCl produce 0.5*0.964 moles of H2(1/2=0.5) =0.482 moles 0.482 moles of H2= 1*0.482 g = 0.482 g of H2 2. How many grams of sodium bromide must be reacted with excess flourine if 25.4 g of bromine gas is produced? 2 NaBr (aq) + F 2(g) 2 NaF (aq) + Br 2(l) 1 mole of Bromine= 102.894 g 0.636 moles of Bromine = 102.894*0.636 =65.44 g 3. How many grams of gold is produced by 10.4 g of gold (III) nitrate, which is dissolved in water? 3 Cu (s) + 2 Au(NO 3 ) 3(aq) 3 Cu(NO 3 ) 2(aq) + 2 Au (s) 1 mole of gold= 196.96 g 0.027 moles of gold =196.96*0.027 g= 5.32 g 4. If excess nitric acid acid reacts with how many grams of lithium bromide, to produce 72 grams of lithium nitrate? HNO 3 (aq) + LiBr (aq) LiNO 3(aq) + HBr (aq) 1 mole of LiBr= 86.845 g 1.04 moles of LiBr= 86.845*1.04= 90.32 g Page 1 of 3
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NCVPS Honors Chemistry Module 7, Lesson 1 Mastery Assignment
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