A.DATA TABLEReport FormCalorimetry: Endothermic and Exothermic Reactions:NH4OHMg(HCl)(1)Mass of ammonium nitrate5.9985 g9(2)Volume of water45.0 mL(3)Mass of water +Tale positivtive Jun (3) calculationthe sign of your AT

Given,Mass of ammonium nitrate ,NH4OH= 5.9985 g Volume of water = 45.0 mLWe need to find the mass of…

Answered: . DATA TABLE Report Form Calorimetry:…

. DATA TABLE Report Form Calorimetry: Endothermic and Exothermic Reactions: NH4OH Mg(HC (1) Mass of ammonium nitrate 5.9985 9 (2) Volume of water 45.0 mL (3) Mass of water + (3) calculation

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter16: Thermodynamics: Directionality Of Chemical Reactions

Section: Chapter Questions

Problem 44QRT

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Question

A.
DATA TABLE
Report Form
Calorimetry: Endothermic and Exothermic Reactions:
NH4OH
Mg(HCl)
(1)
Mass of ammonium nitrate
5.9985 g
9
(2)
Volume of water
45.0 mL
(3)
Mass of water +
Tale positiv
tive Jun (3) calculation
the sign of your AT

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Given the following information at 25C, calculate G at 25C for the reaction 2A(g)+B(g)3C(g) Substance Hf(kJ/mol) S(J/molK) A(g) 191 244 B(g) 70.8 300 C(g) 197 164 a 956 kJ b 956 kJ c 346 kJ d 346 kJ e 1.03 103 kJ
9.83 A student performing a calorimetry experiment combined 100.0 mL of 0.50 M HCl and 100.0 mL of 0.50 M NaOH in a coffee cup calorimeter. Both solutions were initially at 20.0°C, but when the two were mixed, the temperature rose to 23.2°C. (a) Suppose the experiment is repeated in the same calorimeter but this time using 200 mL of 0.50 M HCl and 200.0 mL of 0.50 M NaOH. Will the T observed he greater than, less than, or equal to that in the first experiment, and why? (b) Suppose that the experiment is repeated once again in the same calorimeter, this time using 100 mL of 1.00 M HCl and 100.0 mL of 1.00 M NaOH. Will the T observed he greater than, less than, or equal to that in the first experiment, and why?
10.45 Calculate G at 45°C for reactions for which (a) H = 293 kJ; S= -695 J/K (b) H= -1137 kJ; S = 0.496 kJ/K (c) H = -86.6 kJ; S = -382 J/K
9.96 Most first aid "cold packs" are based on the endothermic dissolution of ammonium nitrate in water: NH4NO3(s)NH4+(aq)+NO3(aq) H= 25.69 kJ A particular cold pack contains 50.0 g of NH4NO3 and 125.0 g of water. When the pack is squeezed, the NH4NO3dissolves in the water. If the pack and its contents are initially at 24.0°C, what is the lowest temperature that this bag could reach? (Assume that the ammonium nitrate solution has a specific heat of 4.25J g-l K-l, and that the heat capacity of the bag itself is small enough to be neglected.)
The reaction between magnesium metal and water (l) produces solid magnesium hydroxide and hydrogen gas. Calculate G for the formation of one mole of Mg(OH)2 at 27C and at 39C.
When ammonium chloride is added to water and stirred, it dissolves spontaneously and the resulting solution feels cold. Without doing any calculations, deduce the signs of G, H, and S for this process, and justify your choices.
In the laboratory, POCl3 (phosphorus oxychloride) is used in the manufacture of phosphate esters, which are used in flame retardants and pesticides. It can be prepared by the following reaction at 25C: 2PCl3(g)+O2(g)2POCl3(g) H=572kJ;G=518.7kJ(a) Calculate S. Is the sign reasonable? (b) Calculate S for POCl3. (c) Calculate for POCl3.
Use standard entropies and heats of formation to calculate G f at 25C for (a) cadmium(II) chloride (s). (b) methyl alcohol, CH3OH(l). (c) copper(I) sulfide (s).
Consider the reaction N2O(g)+NO2(g)3NO(g)K=4.41019 (a) Calculate G for the reaction at 25C. (b) Calculate G f for N2O at 25C.
Why is it usually easier to use G to determine the spontaneity of a process rather than Su ?
Some games include dice with more than six sides. If you roll two eight-sided dice, with faces numbered one through eight, what is the probability of rolling two eights? What is the most probable roll?
What determines Ssurr for a process? To calculate Ssurr at constant pressure and temperature, we use the following equation: Ssurr = H/T. Why does a minus sign appear in the equation, and why is Ssurr inversely proportional to temperature?

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