1. A large quantity of chemical energy is stored in a gummybear, which is primarily sugar, C12H22O11. When a gummy bear isplaced in molten KClO3, the sugar is oxidized according to thefollowing thermochemical equation: C12H22O11(s) + 8 KClO3(l) ⇒ 8KCl(s) + 12 CO2(g) + 11 H2O(g) ∆Hrxn = −5488 kJ
If a gummy bear has an average mass of 0.5250 g and is 91.40%sugar, then how many whole gummy bears does it take to bring a cupof water (250.0 mL) at an initial temperature of 20.0°C to theboiling point? The boiling point of water is 100.0°C, the densityof water (20°C) is 0.9982 g/mL, and the specific heat capacity ofwater is 4.184 J/(g•°C).

2. When 50.0 mL of 1.00 M Pb(NO3)2 (d = 1.30 g/mL) and 50.0 mLof 1.50 M KI (d = 1.18 g/mL) are mixed in a constant-pressurecalorimeter, a precipitate forms and the temperature of the mixtureincreases from 19.0°C to 23.3°C.
(a) Indicate if the precipitation reaction is endothermic orexothermic.
(b) Write both the complete and net ionic chemical equations,including phase symbols, for the reaction that occurs when the twosolutions are mixed.
complete:
net ionic:
(c) Calculate the moles of the limiting reactant.
(d) Calculate ∆Hrxn in kilojoules for the precipitation reaction,assuming that the heat capacity of the calorimeter is 15 J/°C inthis case and the specific heat capacity of the solution aftermixing is the same as that of water.