A 8.33 g sample of an unknown salt (MM = 116.82 g/mol) is dissolved in 150.00 g water in a coffee cup calorimeter. Before placing the sample in the water, the temperature of the salt and water is 23.72 °C. After the salt has completely dissolved, the temperature of the solution is 28.54 °C. a. What is the total mass inside the calorimeter in grams? b. What is the change in temperature, in °C, inside the calorimeter? c. Was the dissolution process endothermic or exothermic? d. What quantity of heat, in J, was gained by the solution? Assume the specific heat of the solution is the same as water, 4.184 J/g･ °C. e. What is the total heat for the dissolution reaction of the 8.33 g of salt?   f. What quantity in moles of the unknown salt were used in the reaction?   g. What is the enthalpy change (in kJ/mol of salt) for the dissolution reaction?

MISSED THIS? Watch IWE: Stoichiometry Involving AH; Read Section 7.6. You can click on the Review link to access the section in your eText. Titanium reacts with iodine to form titanium(III) iodide, emitting heat. 2Ti(s) +31₂(g) → 2Til3(s), AH = -839 kJ Part A Determine the mass of titanium that reacts if 2.30 x 10³ kJ of heat is emitted by the reaction. Express your answer to three significant figures and include the appropriate units. m(Ti) = Part B m(1₂) = μA Value Request Answer Ti Determine the mass of iodine that reacts if 2.30 x 10³ kJ of heat is emitted by the reaction. Express your answer to three significant figures and include the appropriate units. μA Value Units Request Answer ? Units ?

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What are some examples of exothermic and endothermic reactions or processes you've seen in real life aside from hot and cold packs?

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1. A thermometer placed in a solution undergoing a chemical reaction indicates an increase in temperature as the reaction proceeds. Is this reaction endothermic or exothermic? Describe if heat energy is lost or gained from the reaction (the system) to the surroundings. What is the sign of the enthalpy change (AH) of this reaction? 2. A student performs a reaction and determines the enthalpy change (AH) to be 31.4 kJ. Will the temperature of the surrounding solution increase or decrease as a result of this chemical process? 3. If you hold 3 grams of ice in your hand at room temperature, your hand will become cold. a) Is the reaction H,O(s) – H,O(1) endothermic or exothermic? b) In which direction does heat flow?

Consider these reactions: Reaction 1: H₂(g) + Cl₂ (g) Reaction 2: 20F2 (g) O2(g) +2 F2 (g) AH Reaction 3: N₂(g) + 2O2(g) → 2NO₂(g) AH = +66.4 kJ Use Reaction 1. — → 2HCl(g) AH = -184.6 kJ g = -49.4 kJ Determine the mass, in grams, of chlorine gas consumed (with excess H₂) when 1,959.0 kJ of energy is released from the system. Round to the nearest whole number. Answer:

In order to break water into hydrogen and oxygen, water is heated to more than 500°C. Which kind of reaction is this and why? It is exothermic because heat needs to be released by the reactants to form the products. It is endothermic because heat needs to be released by the reactants to form the products It is exothermic because heat needs to be absorbed by the reactants to form the products. It is endothermic because heat needs to be absorbed by the reactants to form the products.

A 50.0-g piece of metal at 80.0 °C is placed in 100 g of water at 22.0 °C contained in a calorimeter like that shown in Figure 5.12. The metal and water come to the same temperature at 24.6 °C. Water has a heat capacity of 4.18 J/g°C. a. How much heat did the metal give up to the water?   b. What is the specific heat capacity of the metal?   c. If it is one of the substances found in Table 5.1, what is its likely identity?