Sample 1 Sample 2 [1] Volume of HCI (mL) 50.2 50.2 [2] Temperature of HCI (mL) 24.8 24.3 [3] Volume of NaOH (mL) 49.8 49.9 [4] Temperature of mixture after reaction ("C) 31.8 31.0 Temperature difference ("C) [5] Number calories evolved (cal) enter a positive value [6] Moles of H* that were neutralized (mol) [7] Calories evolved per mole of H* (cal/mol) Average of the two trials of calories evolved per mole of H*

1

A certain reaction has Ho = -43.40 kJ and So = 23.20 J/K.(a) Is this reaction exothermic, endothermic or isothermic (neither)?This reaction is________      .(b) Does this reaction lead to a decrease, an increase, or no change in the degree of disorder in the system?This reaction leads to_______      in the disorder of the system.

TUMU Consider these reactions: Reaction 1: H₂(g) + Cl₂(g) → 2HCl(g) AH = -184.6 kJ Reaction 2: 20F 2(g) → O₂(g) + 2 F₂ (g) Reaction 3: N₂(g) +202(g) →→→ 2NO₂(g) Use Reaction 1. Answer: AH = -49.4 kJ Determine the mass, in grams, of chlorine gas consumed (with excess H₂) when 1,152.0 kJ of energy is released from the system. Round to the nearest whole number. g AH = +66.4 kJ

Question 4 From the following data, H2 (g) + Cl2 (g)→ 2HCI(g) AHV = -185 kJ 2H2 (g) + O2 (g)→2H20(g) AH = -483.7 kJ pero determined w -0.1kg initial - 56 C Melte Chemi calculate AH for the following reaction. How muc convert 155.0 heat c 4HCI(g) + O2 (g)→ 2CI2 (g) + 2H20(g) J/g J/g O -299KJ O -114kJ O 114kJ O 299kJ