Name Section GENERAL CHEMISTRY I EXAM 2 FALL 2015 Question Points Possible Points Earned 1 2 3 4 5 6 25 20 15 20 20 25 Total 1 The balanced reaction for the neutralization of sodium bicarbonate with hydroiodic acid is below NaHCO3 HI H2O CO2 NaI a 2 13 grams of sodium bicarbonate react with 25 mL of 6 0M hydroiodic acid i Calculate the mass of carbon dioxide can be produced ii Calculate the mass of excess reagent iii 0 98 grams of carbon dioxide are actually produced Calculate the percent yield for the reaction iv Calculate the molar concentration in mol L of the ionic salt produced by the reaction 2 250 mL of 1 0M sodium iodide is mixed with 250 mL of 1 0M lead II nitrate This combined solution is then added to 250 mL of 1 0 M ammonium acetate a Give the identity of each ion present before the solutions were mixed Include the formula and charge b For each ion listed above give the molar concentration in mol L c Considering all three cations which could form a precipitate d Considering all three anions which could form a precipitate e Write the balanced net ionic equation for the precipitate that forms and give its molar weight in g mol f Calculate the mass of the precipitate that forms once all three solutions are mixed and have reacted completely 3 Consider the reaction between hydrochloric acid and barium hydroxide a Write the balanced molecular equation b Write the balanced total ionic equation c Write the balanced net ionic equation d What volume of water must be added to 25 0 mL of 12 0M hydrochloric acid to produce a 2 6M solution e What volume of a 2 6M barium hydroxide solution is necessary to neutralize 250 mL of a 2 6M hydrochloric acid solution 4 0 383 grams of an unknown gas has a volume of 100 mL at a pressure of 851 Torr and a temperature of 25 0 C volume of the gas a Temperature held constant and pressure increased to 2 53 atm calculate the new b Pressure held constant and temperature decrease to 21 3 C calculate the new volume of the gas c Volume held constant and pressure decreased to 663 mmHg calculate the new temperature of the gas d What is the molar mass of the gas in g mol 5 Consider the following reaction Zn 2HCl ZnCl2 H2 a Show that this is a redox reaction by writing the half reactions for the elements that are oxidized and reduced b Which element is the oxidizing agent c What mass of zinc is required to completely neutralize 250 mL of a 2 0M hydrochloric acid solution d What volume of hydrogen gas would be produced if the reaction took place at a pressure of 1 35 atm and a temperature of 27 1 C 6 15 3 grams of an unknown monoprotic organic acid containing carbon hydrogen and oxygen was burned in air to produce 9 18 grams of water and 22 4 grams of carbon dioxide Another 15 3 gram sample of the acid was added to 51 mL of water It was then neutralized completely with 153 mL of a 1 665M sodium hydroxide solution a Determine the empirical formula of the unknown compound b Calculate the molar mass of the unknown compound c Determine the molecular formula of the unknown compound d Calculate the molar concentration of the original acid solution before it was titrated against the sodium hydroxide solution
View Full Document
Unlocking...