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Name: ___________________________________ Per: ____ Moles/Balancing Homework Packet This packet is due ______________ This packet contains: 1. Mole problems / 2. Percent composition / 3. Balancing equations / 4. Questions for Textbook readings a. “Methyl Alcohol” pg 265 / 5. Vocabulary sheet (use notes) / 6. True and false / 7. Castle Learning Score / Total points / Mole Vocabulary Mole Conservation of Mass Balanced Equation Reactants Products Coefficient Gram Formula Mass Molecular Formula Empirical Formula Molar Volume of a Gas Moles Worksheet 1) Define “mole”. 2) How many moles are present in 34 grams of Cu(OH)2? 3) How many moles are present in 2.45 x 1023 molecules of CH4? 4) How many grams are there in 3.4 x 1024 molecules of NH3? 5) How much does 4.2 moles of Ca(NO3)2 weigh? 6) What is the gram formula mass of MgO? 7) How are the terms “gram formula mass” and “atomic mass” different from one another? 8) Which is a better unit for expressing gram formula mass, “amu” or “grams/mole”? Explain your reasoning Mole Calculation Worksheet 1) How many moles are in 15 grams of lithium? 2) How many grams are in 2.4 moles of sulfur? 3) How many moles are in 22 grams of argon? 4) How many grams are in 88.1 moles of magnesium? 5) How many moles are in 2.3 grams of phosphorus? 6) How many grams are in 11.9 moles of chromium? 7) How many moles are in 9.8 grams of calcium? 8) How many grams are in 238 moles of arsenic? What are the gram formula masses of the following compounds? 9) NaOH 12) H3PO4 10) H2O 13) Mn2Se7 11) MgCl2 14) (NH4)2SO4 Percentage Composition Worksheet Give the % composition of all elements in these compounds. Show all work! ________________________________________________________________ 1) NH4SO3 % N ______ % H ______ % S ______ % O ______ ________________________________________________________________ 2) Al(C2H3O2)3 % Al ______ % C ______ % H ______ % O ______ ________________________________________________________________ 3) NaBr % Na ______ % Br ______ ________________________________________________________________ 4) Cu(OH)2 % Cu ______ % O ______ % H ______ ________________________________________________________________ 5) MgCO3 % Mg ______ % C ______ % O ______ ________________________________________________________________ Balancing Chemical Equations Balance the equations below: 1) ____ N2 + ____ H2 ____ NH3 2) ____ KClO3 ____ KCl + ____ O2 3) ____ NaCl + ____ F2 ____ NaF + ____ Cl2 4) ____ H2 + ____ O2 ____ H2O 5) ____ Pb(OH)2 + ____ HCl ____ H2O + ____ PbCl2 6) ____ AlBr3 + ____ K2SO4 ____ KBr + ____ Al2(SO4)3 7) ____ CH4 + ____ O2 ____ CO2 + ____ H2O 8) ____ C3H8 + ____ O2 ____ CO2 + ____ H2O 9) ____ C8H18 + ____ O2 ____ CO2 + ____ H2O 10) ____ FeCl3 + ____ NaOH ____ Fe(OH)3 + ____NaCl 11) ____ P + ____O2 ____P2O5 12) ____ Na + ____ H2O ____ NaOH + ____H2 13) ____ Ag2O ____ Ag + ____O2 14) ____ S8 + ____O2 ____ SO3 15) ____ CO2 + ____ H2O ____ C6H12O6 + ____O2 Is this Statement True or False? The following statements can be true or false. You must identify it as true or false and then explain your reasoning for your answer. 1. An equation is balanced when there are the same numbers of molecules on both sides. 2. The masses of the products have to equal the masses of the reactants. 3. In a single replacement reaction there must be an element only in the reactants. 4. A synthesis reaction has 2 reactants but only 1 product 5. A mole is a unit of mass. 6. A mole of any gas always has a volume of 22.4 Liters. 7. Grams can be converted directly into particles. 8. You can change a coefficient to balance an equation. 9. There are the same numbers of molecules in 32.0 g of O2 as there are in 71 g of Cl2. Methyl Alcohol: Fuel with a Future? P. 265 1) What are TWO advantages of replacing gasoline with methyl alcohol (methanol)? 2) What are the dangers of Carbon Monoxide and Nitrogen dioxide in our atmosphere? 3) What reaction causes the formation of Nitrogen dioxide? 4) What are three problems of using Methyl alcohol instead of gasoline? 5) Balance the following equation for the combustion of methanol: ____CH3OH + ____O2 ____CO2 + ____H2O 6) Why is this classified as a combustion reaction?