1. Ammonia can be generated by heating together the solids NH4Cl and Ca(OH)2. Other products of the reaction include CaCl2 and H2O. Initially a mixture of 33.0 g each of NH4Cl and Ca(OH)2 was heated. a. If the calculated percent yield was 98.27%, what is the experimental mass of the ammonia obtained? 2. A coffee-cup calorimeter having a heat capacity of 472 J/°C is used to measure the heat evolved when the following aqueous solutions, both
1. Ammonia can be generated by heating together the solids NH4Cl and Ca(OH)2. Other products of the reaction include CaCl2 and H2O. Initially a mixture of 33.0 g each of NH4Cl and Ca(OH)2 was heated.
a. If the calculated percent yield was 98.27%, what is the experimental mass of the ammonia obtained?
2. A coffee-cup calorimeter having a heat capacity of 472 J/°C is used to measure the heat evolved when the following aqueous solutions, both initially at 22.6°C, are mixed: 100. g of solution containing 6.62 g of lead(II) nitrate, Pb(NO3)2, and 100. g of solution containing 6.00 g of sodium iodide, NaI. The final temperature is 24.2°C. Assume that the specific heat of the mixture is the same as that for water, 4.184 J/g · °C. The reaction is: Pb(NO3)2(aq) + 2NaI(aq) → PbI2(s) + 2NaNO3(aq)
a. Calculate the heat evolved (in kJ) in the reaction.
b. Calculate the ΔH (in kJ/mol) for the reaction under the conditions of the experiment.
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