Question

The next three questions will take you through the calculation of Delta H for the following reaction using Hess's Law. Follow the steps and answer each question in turn 2Baco, (s) -----> 2Ba (s) + O2(g) + 2CO2 (g) AH = ? Given the following reactions and thermochemical data: 1. BaO (8) + CO2 (g) ----ảy> BaCO3 (5) AH = 274 VI 2. 2 Bao (s) -------> 2 Ba (s) + O2(g) AH + 1096.2 kJ After rearranging as if needed for Hess' Law, the delta H for reaction 1 is: Select one or more a. 554.8 b.-554.8 kJ C +1019.6 kJ d. - 1019.6k 2Baco, () -----> 2B (s) + O2(g) + 2002 (Q) AH = ? Given the following reactions and thermochemical data: 1. BaO (5) + CO2 (g) -ã\> BaCO (3) AH = 277,4 k! 2. 2 Bao (s) --- > 2 Ba (s) + O2(g) AH = + 1096.2 kJ Using the data above After rearranging as/if needed for Hess' Law, the delta H for reaction 2 is Select one: a. 1096.2 b. -1096.2 kJ OC 21924) O d. -21924

Answer 1

* Bacoz -2 Ba + a coa ; Bao & coges Baco3cs) ..olly & Bao +a Bacs) + O2(g) 19, A versing and multiplying the equation (1) wilth by 2 and adding with nation (a, we obtain the main reaction 2 Bacog typeo +2602 3 900 + 80a + 2 Baloz & Ba + O2 + 2002 The on for rean(a, after rearranging ist we reverse the reaction the signs will reverse gn=+277.4 kJ then we multiplied by a = 277.4+2 : 554.8 kg. option ca, is correct.

on reaction (2, no rearrangement was done there force on remain the same - ie on=+1096-2k]. option 'a' es correct.
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