Thermochemistry: Calorimetry and Hess\'s Law Date PRE-LAB QUESTIONS 1. Calculate

Question

Thermochemistry: Calorimetry and Hess's Law Date PRE-LAB QUESTIONS 1. Calculate the enthalpy change for the reaction Given the following enthalpies of reaction: Two solid objects, A and B, are placed in boiling water and allowed to come to temperature there. 2. beakers containing 100 g water at 10.0°C. Object by 2.60°C A increases the water temperature by 3.S0G B increases the water temperature Which object has the larger heat capacity? Explain your reasoning y is t reaonable to asume the specnd HC solutions are the same as water, 4.18 J/g-c? When a 3,76 g sample of solid ammonium nitrate dissolves in 60.0 g of water in a coffee-cup calorimeter, the temperature drops from 22.0C to 16.90. Calculate ?1 (in kl/mol NH,NO) for the solution process: 4. NH,No,(s)--NH,'(aq) + No,-(aq) Assume that the specific heat of the solution is the same as that of pure water, and determine whether this process is endothermic or exothermic. 105

Explanation / Answer

1) euqation 2 - equation 1 gives
   P4O6 + 2 O2 --------> P4O10   and Enthalpy change = -2940.1 kJ -(-1640.1 kJ) = -1300 kJ

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