A 0.75 g sample of KCl is added to 50.0 g of H2O in a Styrofoam cup andstirred until it dissolves. The temperature of the solution starts at 26.0°C. Ifthe heat of solution of KCl is +17.0 kJ/mol KCI, what is the final temperatureof the solution? You may assume that the aqueous solution has the samespecific heat as water.A II

Given that: Mass of KCl = 0.75 g Mass of water = 50.0 g Initial temperature is 26.0oC Heat of the…

A 0.75 g sample of KCl is added to 50.0 g of H20 in a Styrofoam cup and stirred until it dissolves. The temperature of the solution starts at 26.0°C. I the heat of solution of KCl is +17.0 kJ/mol KCl, what is the final temperatur of the solution? You may assume that the aqueous solution has the same ifio hoot og

A 0.75 g sample of KCl is added to 50.0 g of H20 in a Styrofoam cup and stirred until it dissolves. The temperature of the solution starts at 26.0°C. I the heat of solution of KCl is +17.0 kJ/mol KCl, what is the final temperatur of the solution? You may assume that the aqueous solution has the same ifio hoot og

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Two student chemists measured 25.0mL of 1.00 M NaOH in separate calorimeters as in the experimental procedure, Part B. Student 1 added 25.0mL of 1.10 M HCl in his solution of NaOH. Student 2 added 22.7mL of 1.10 M HCl in his NaOH solution. Each student recorded the temperature change and calculated the enthalpy of neutralization. Complete the following table to assist in answering the below questions. NOTE: Limiting reactant needs to be identified to calculate the enthalpy of neutralization. Student 1 Moles of NaOH _________ Moles of HCl added _________ Limiting reactant _________ Moles of H2O produced _________ Mass of final mixture _________ Student 2 Moles of NaOH _________ Moles of HCl added _________ Limiting reactant _________ Moles of H2O produced _________ Mass of final mixture _________ Explain why and how (higher or lower) the temperature will be different for the two…
An experiment is carried out where 12.2g of NaOH is dissolved in 240.0g of water in a coffee cup calorimeter. Dissolution is not a chemical reaction, but is a chemical process. NaOH(s) → Na+(aq) + OH-(aq) The mixture can be assumed to have the same specific heat capacity as liquid water (4.18J/g.C) What is the massof the sorroundings where the temperature is being measured in this experiment?
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4. The reaction of 250.0 mL of a 1.00 M hydrochloric acid solution with 250.0 mL of a 1.00 M sodium hydroxide solution was carried out in a constant pressure calorimeter. The total heat capacity of the calorimeter plus solutions was 6.45 kJ/K. The temperature of the calorimeter and solutions increased by 2.11°C. What is AH (in kJ) for the neutralization of 1.00 mol HCl(aq) by NaOH(aq)? A) -54.4 B) -21.2 +12.6 +54.4 E) -12.6
5.00 g of potassium hydroxide (molar mass = 56.1 g/mol) dissolves in 100.0 g of water and the temperature of the solution increases by 1.60oC. Calculate ΔH for the reaction in kJ/mol of KOH .The specific heat capacity of the solution is 4.18 J/goC ( Hint: the mass of the solution is 105g) (Hint #2: is this + or -?) Your answer should be in kJ/mol and have 3 sig figs
When the Cacl2(s) is added to water, the following reaction occurs. Cacl (s) – Ca²"(aq) + 2CI"(aq) AH = - 81.5 kJ A 24.1 g sample of Caclz is dissolved in water, with both substances at 25.0 °C. Calculate the final temperature (in °C) of the solution assuming no heat is lost to the surroundings, the final solution, containing Cacl2 and water, has a mass of 100.0 g and the solution has a specific heat capacity of 4.18 J °c-lg-1. The molar mass of CaCl2 = 110.98 g/mol Do not include units in your answer, If you round during your calculations make sure to keep at least 3 decimal places. Report your answer to one (1) decimal place. Answer: 59.0 The correct answer is: 67.3
The overall reaction in a commercial heat pack can be represented as 4 Fe(s) + 30₂(g) → 2 Fe₂O₂ (s) AH = -1652 kJ a. How much heat is released when 4.80 moles of iron are reacted with excess O₂? Heat = kJ b. How much heat is released when 1.00 mole of Fe2O3 is produced? Heat = kJ c. How much heat is released when 1.40 g iron is reacted with excess O₂? Heat = kJ d. How much heat is released when 11.4 g Fe and 1.90 g O₂ are reacted? Heat = kJ Submit Answer Retry Entire Group 9 more group attempts remaining
How much heat is released at constant pressure if 12.3 mL of 0.161 M silver nitrate is mixed with 41.7 mL of 0.493 M potassium chloride? AGNO3(aq) + KCI(aq) AgCI(s) + KNO3(aq), AH° = -65.5 kJ O a 0.129 kJ Ob. 1.34 kJ Oc. 32.2 kJ O d. 10.5 kJ O e. 1.47 kJ
The heat capacity of an object indicates how much energy that object can absorb for a given increase in that object's temperature. In a system in which two objects of different temperatures come into contact with one another, the warmer object will cool and the cooler object will warm up until the system is at a single equilibrium temperature. Note the difference between the terms molar heat capacity, which has units of J/(mol-K). and specific heat, which has units of J/(g-K). Remember to use 3 significant figures for all answers unless stated otherwise in the problem. Common issues with this problem involve entering units incorrectly into the answer field. Please check this help website for a refresher on how to enter units in Mastering Chemistry: http://help.pearsoncmg.com/mastering/student/standalone/TopicsStudent/acceptable units list.htm The margin of error is 2%. Part A A volume of 75.0 mL of H₂O is initially at room temperature (22.0 °C). A chilled steel rod at 2.00 °C is placed…
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When 15.00 mL of 3.00 M NaOH was mixed in a calorimeter with 13.10 mL of 3.00 M HCI, both initially at room temperature (22.00 °C), the temperature increased to 29.60 °C. The resultant salt solution had a mass of 28.10 g and a specific heat capacity of 3.74 J K- g-. What is the heat capacity of the calorimeter (in J/°C)?Note: The molar enthalpy of neutralization per mole of HCl is -55.84 kJ mol-1