Homework Answers
a) It is an exothermic process: the temperature increases due to a heat transfer from the system.
b) The temperature change is measured from the starting temperature (26°C) to the constant maxiumum value (~34°C) so:
c) The enthalpy of solution can be obtained as:
where m is the mass of water (remember that density of water is 1g/mL so, the volume and the mass are numerically identical) and Cp is the heat capacity of water (4.184J/g*°C), so:
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Please show work! 3. The data graphed at the right was obtained when 4.00 g of a salt (molar mass = 80.0 g/mol) was...
A 7.41 g sample of an unknown salt (MM = 116.82 g/mol) is dissolved in 15.00...
A 7.41 g sample of an unknown salt (MM = 116.82 g/mol) is dissolved in 15.00 g water in a coffee cup calorimeter. Before placing the sample in the water, the temperature of the salt and water is 23.72 degrees celsius. After the salt has completely dissolved, the temperature of the solution is 28.54 degrees celsius. A) Was the dissolution process endothermic or exothermic? B) What is the heat for the dissolution reaction?
The molar mass of solid is 110.98 g/mol PART IV MOLAR MASS OF SOLID Mass of...
The molar mass of solid is 110.98 g/mol
PART IV MOLAR MASS OF SOLID Mass of Calorimeter (g) 10%1841 991565p S10005 Mass of Calorimeter plus water (g) Mass of water (g) Mass of unknown solid (g) alig'c 28.3 Initial temperature (°C) Final temperature (C) Temperature change (AT) Heat, q (kJ) Heat of solution per gram of solid (kJ/g) Heat of solution per mole of compound (kJ/mol) DATA ANALYSIS 1. Calculate q solution (Cs for water is 4.184 J/g°C) 2. Identify...
5 g of molten NaCl is at melting temp. The salt is added to 25 mL...
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8 4 points When a 0.456 g sample of salt is dissolved into water in a...
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1. 5.00 g of urea, (NH2)2CO is dissolved in 250.0 mL of water(density = 1.00 g/mL)...
1. 5.00 g of urea, (NH2)2CO is dissolved in 250.0 mL of water(density = 1.00 g/mL) at 30.0oC in a coffee cup calorimeter. When this is done, 27.6 kJ of heat is absorbed. (5 points) a) Is the solution process exothermic or endothermic? c) What is qwater? d) What is the final temperature of the solution(specific heat constant of water is 4.18 J/g.OC)? Please show all the work!! thank you very much :)
Compound Δ Hrxn (kJ/mol) NH4NO3 + 25.7 KCl + 17.2 NaOH -44.5 KOH -57.6 You are...
Compound Δ Hrxn (kJ/mol) NH4NO3 + 25.7 KCl + 17.2 NaOH -44.5 KOH -57.6 You are given 6.9 grams of an unknown salt. You dissolve it in 56.5 mL of water. As the salt dissolves, the temperature of the solution changes from an initial temperature of 28.9°C to a final temperature of 22.9°C. Based on the chart of ΔH values and the temperature change, you can determine which salt you have. What is the temperature change? Δ T = o C...
A generic solid, X, has a molar mass of 72.6 g/mol. In a constant-pressure calorimeter, 16.6...
A generic solid, X, has a molar mass of 72.6 g/mol. In a constant-pressure calorimeter, 16.6 g of X is dissolved in 365 g of water at 23.00 °C. X($) — X(aq) The temperature of the resulting solution rises to 27.80 °C. Assume the solution has the same specific heat as water, 4.184 J/(g°C), and that there is negligible heat loss to the surroundings. How much heat was absorbed by the solution? 9 kJ What is the enthalpy of the...
1. A coffee cup calorimeter was used for the neutralization reaction of 100 mL of 1.00...
1. A coffee cup calorimeter was used for the neutralization reaction of 100 mL of 1.00 M hydrochloric acid with 100 mL of 1.20 M sodium hydroxide. The initial temperature was 22.88 °C and the final temperature was 29.39 °C. Calculate the calorimeter constant for the reaction. HCl (aq) + NaOH (aq) NaCl (aq) + H2O (∆H°rxn = -58.3 kJ/mol) 2. The same calorimeter was used for the dissolution of 8.86 g sample of lithium chloride in 100.0 mL of...
A generic solid, X, has a molar mass of 61.0 g/mol. In a constant-pressure calorimeter, 25.5...
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Q 1. a. A process in which heat is given off is said to be _____________________...
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The molar mass of solid is 110.98 g/mol
PART IV MOLAR MASS OF SOLID Mass of Calorimeter (g) 10%1841 991565p S10005 Mass of Calorimeter plus water (g) Mass of water (g) Mass of unknown solid (g) alig'c 28.3 Initial temperature (°C) Final temperature (C) Temperature change (AT) Heat, q (kJ) Heat of solution per gram of solid (kJ/g) Heat of solution per mole of compound (kJ/mol) DATA ANALYSIS 1. Calculate q solution (Cs for water is 4.184 J/g°C) 2. Identify...
8 4 points When a 0.456 g sample of salt is dissolved into water in a completely insulated calorimeter (a simple styrofoam coffee cupl. the temperature of the 500 ml water decreases by 0.940°C. What is the heat for the system (the salt dissolving)? O 1.79kJ 0 +1.80 kJ O +214) O 0.214 - 1.96 kJ +1.97 Ooo
A generic solid, X, has a molar mass of 72.6 g/mol. In a constant-pressure calorimeter, 16.6 g of X is dissolved in 365 g of water at 23.00 °C. X($) — X(aq) The temperature of the resulting solution rises to 27.80 °C. Assume the solution has the same specific heat as water, 4.184 J/(g°C), and that there is negligible heat loss to the surroundings. How much heat was absorbed by the solution? 9 kJ What is the enthalpy of the...
A generic solid, X, has a molar mass of 61.0 g/mol. In a constant-pressure calorimeter, 25.5 g of X is dissolved in 387 g of water at 23.00 °C. X(s) X(aq) The temperature of the resulting solution rises to 29.00 °C. Assume the solution has the same specific heat as water, 4.184 1/(8°C), and that there is negligible heat loss to the surroundings. How much heat was absorbed by the solution? = KJ What is the enthalpy of the reaction?...
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