1.-The following eq. represents the complete combustion ofethane: 2C 2 H 6 (g) +

Question

1.-The following eq. represents the complete combustion ofethane: 2C2H6(g) + 7O2(g) ---->4CO2(g) + 6H2O(g) At the same temperature and pressure, what is the maximumvolume in liters of carbon dioxide that can be obtained from 50 Lof C2H6 and 250 L of oxygen? a)25 b) 50 c)100 d) 150 e) 200 2.-Calcium nitrate will react with ammonium chloride atslightly elevated temperatures, as represented in theequation Ca(NO3)2(s) + 2NH4Cl(s)------> 2N2O(g) + CaCl2(s) +4H2O(g)   A 3.00 mol sample of each reactantwill give what volume of N2O at STP? a) 11.2L b) 22.4 L c) 33.6 L d) 44.8 L e) 67.2L 1.-The following eq. represents the complete combustion ofethane: 2C2H6(g) + 7O2(g) ---->4CO2(g) + 6H2O(g) At the same temperature and pressure, what is the maximumvolume in liters of carbon dioxide that can be obtained from 50 Lof C2H6 and 250 L of oxygen? a)25 b) 50 c)100 d) 150 e) 200 2.-Calcium nitrate will react with ammonium chloride atslightly elevated temperatures, as represented in theequation Ca(NO3)2(s) + 2NH4Cl(s)------> 2N2O(g) + CaCl2(s) +4H2O(g)   A 3.00 mol sample of each reactantwill give what volume of N2O at STP? a) 11.2L b) 22.4 L c) 33.6 L d) 44.8 L e) 67.2L

Explanation / Answer

50L C2H6 *(7 L O2/2L C2H6) = 175 L oxygen 50 L of C2H6 requires 175 L O2 to react. You are given 250 L O2, soO2 is in excess. C2H6 is limiting reactant amount of CO2:   50L C2H6 *(4 L CO2/2 L C2H6) = 100 LCO2 answer is c) 2) ammonium chloride is limiting reactant, since it has the higherstoichiometric coefficient thatn Ca(NO3)2. (3 moles of NH4Cl requires 1.5 moles of Ca(NO3)2) 3 mol NH4Cl will yield 3 moles of N2O PV = nRT V = nRT/P = (3 mol *0.0821 L*atm/mol/K)*273K/1atm = 67.2 L answer is c)

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