Use Reaction 1. Determine the mass, in grams, of chlorine gas consumed (with excess H₂) when 1,479.0 kJ of energy is released from the system. Answer: g (mass must be positive; round to nearest whole number)

|| Question 15 A calorimeter holds 25 g water at 25.0°C. A sample of hot iron is added to the water, and the final temperature of the water and iron is 30.0°C. What is the change in en- thalpy associated with the change in the water's temperature? Note: The specific heat of water is 4.18 g°c. Use the formula AH = - cm AT %3D Show your work. IUS

The following thermochemical equation is for the reaction of carbon monoxide(g) with oxygen(g) to form carbon dioxide(g). 2CO(g) + O2(g)- →2CO2(g) AH=-566 kJ How many grams of CO(g) would have to react to produce 104 kJ of energy? grams

A chemist measures the energy change AH during the following reaction: Cl₂(g) + H₂(g) → 2 HC1 (g) AH=184. kJ Use the information to answer the following questions. endothermic. This reaction is... 0 exothermic. Suppose 28.0 g of Cl₂ react. Yes, absorbed. Yes, released. Will any heat be released or absorbed? No. If you said heat will be released or absorbed in the second part of this question, calculate how much heat will be released or absorbed. Round your answer to 3 significant digits. ☐kJ x10 X ?