Chapter Three Extra Practice Problems1. Balance the following chemical equations: a) Na + H2O ÆNaOH(aq) + H2(g) b) C2H4+ O2ÆCO2+ H2O c) Al + HCl ÆAlCl3+ H2d) N2O5+ H2O ÆHNO3e) (NH4)2Cr2O7ÆN2+ Cr2O3+ H2O f) PCl3+ H2O ÆH3PO3+ HCl g) Mg3N2+ HCl ÆMgCl2+ NH4Cl h) C6H6+ O2ÆCO2+ H2O i) C3H5NO + O2ÆCO2+ NO2+ H2O 2. Consider the following chemical equation: C2H5OH + O2ÆCO2+ H2O a) How many moles of CO2are produced when 5.00 mol of C2H5OH is burned according to the equation? b) How many grams of CO2are produced when 5.00 g of C2H5OH is burned according to the equation? 3. Consider the following equation: Na2SiO3+ 8HF ÆH2SiF6+ 2NaF + 3H2O a) How many moles of HF are required to dissolve 1.50 mol of Na2SiO3? b) How many grams of NaF form when 3.00 mol of HF reacts in this way? c) How many grams of Na2SiO3can be dissolved by 3.00 g of HF?
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