Sample problem: In a calorimeter, completely neutralize 100 mL of an aqueous solution of sodium hydroxide (NaOH) at 0.5 mol/L by adding 100 mL of a hydrochloric acid (HCI) solution at 0.5 mol/L. The initial temperature of the solutions before being mixed is 22.5 C. The highest temperature obtained during the neutralization, after the two solutions are mixed, is 25.9 C. Calculate the molar heat of neutralization of sodium hydroxide. DATA: Motal = C= AT = Q=? Step 1 Calculation of the quantity of heat transferred:

Sample problem: In a calorimeter, completely neutralize 100 mL of an aqueous solution of sodium hydroxide (NaOH) at 0.5 mol/L by adding 100 mL of a hydrochloric acid (HCI) solution at 0.5 mol/L. The initial temperature of the solutions before being mixed is 22.5 C. The highest temperature obtained during the neutralization, after the two solutions are mixed, is 25.9 C. Calculate the molar heat of neutralization of sodium hydroxide. DATA: Motal = C= AT = Q=? Step 1 Calculation of the quantity of heat transferred:

Chemistry & Chemical Reactivity

9th Edition

ISBN:9781133949640

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter5: Principles Of Chemical Reactivity: Energy And Chemical Reactions

Section5.6: Calorimetry

Problem 2RC: If, in the experiment described in the previous question, some energy as heat is transferred from...

See similar textbooks

Similar questions

Background info: A unit of heat energy=calorie=amount of heat that raises 1 g of liquid water by 1 degrees C. 1) How many calories of heat need to be removed from a 100 g sample of water to drop the temperature from 99 degrees C to 1 degrees C ? 2) How many calories of heat will raise the temperature of 60g of ethylene gylcol from 10 degrees C to 50 degrees C?
PART II. PROBLEM SOLVING A student was asked to determine the enthalpy of solution of KCIO3 in water using Styrofoam calorimetry. Calibration was performed by mixing 8.00 mL 0.050 M HCl with 2.00 mL 0.200 M NaOH. The neutralization reaction (AH = -55.85 kJ/mol) was accompanied by a temperature change from 25.0 to 28.3°C. Using the same calorimeter, 0.300 g KCIO3 (MW: 122.55) was dissolved in water and the temperature was observed to change from 23.6 to 17.3°C. (Assume that the total volume of the mixture in calibration is the same in the enthalpy measurement) What is the calorimeter constant in kJ/°C? Answer: What is the enthalpy of dissolution of KCIO3 in kJ/mol? Answer:
At the end of the neutralization reaction of 0.5 mL nitric acid with 0.28 m 18 mL sodium hydroxide with 42%, a temperature increase of 15 °C was observed and the heat value was determined as 825 cal. According to these results; a) number of moles of neutralized base? b) enthalpy of reaction, reaction according to the value of enthalpy? c) constant of calorimeter in water? (d(HNO3) = 1,51g/mL; M(HNO3)=63,01 g/mol)
J 3) If 4.00 g of iron metal are reacted in a calorimeter with a heat capacity of 400. C' what would be the final temperature of the calorimeter if its initial temperature were 23.0°C?
I need help with this problem. I get -1.4 kJ using qrxn = -(mcsdeltaT) 20. The chemical equation for the reaction between hydrochloric acid and sodium hydroxide is HCl(aq) + NaOH(aq) NaCl(aq) + H2O(l) When 25 mL of 1.0 M HCl (36.5 g/mol) is mixed with 25 mL of 1.0 M NaOH (40 g/mol), the temperature change of the mixture is 6.9 oC. The density of the mixture is 1.00 g/mL and the specific heat of the solution is 4.18 J/ g oC. What is the enthalpy change for this reaction? a. -1.4 kJ b. -29 kJ c. 29 kJ d. -58 kJ
(Expert Answer) A 90.0 g X D (Expert Answer] A 90.0 g x 101 Chem101 B When 0.0901 mol of an u X 01edu.co Question 8 of 8 0.700 moles of an unknown solid is placed into water to make 150.0 mL of solution. The solution's temperature decreases by 6.61°C. Calculate AH, in kJ/mol, for the dissolution of the unknown solid. (The specific heat of the solution is 4.184 J/g.°C and the density of the solution is 1.02 g/mL).
QUESTION 7 Bb:Q-id:E3.b.gibbs Calculate the value of AG in kj for the combustion of 1 mole of butane (C4H10) with molecular oxygen to form carbon dioxide and gaseous water, using the values of AGf given below in kJ/mol. AGf (C4H10(g)) = -10. AGf (CO2(g)) = -391. AG (H20(g) = -225. Enter value as an integer (value + 2).
1. When 25.0 mL of 0.25 mol/L LiOH and 25.0 mL of 0.25 mol/L HCl are mixed together, the temperature warms 15.8°C. What is the molar enthalpy of neutralization for LiOH? I attached my answer but am unsure.
Given the reactions, X(s) + 1/2O₂(g) XCO₂ (s) XO(s) XO(s) + CO₂(g) what is AH for this reaction? X(s) + 1/2O₂(g) + CO₂(g) AH = -763.1 kJ AH = +159.3 kJ XCO3(s)
Calculate the AH° for the following reaction using the information below it. C(s) + CH,(g) + H2(g) C(s) + 2 H2(g) 2 CH,(g) C,H,(g); CH4(g); C,H(g) + H2(g); AF = 65 kJ AH = ? AH = -75 kJ O A. 140 kJ O B. -85 kJ OC. -140 kJ O D. 10 kJ O E. -10 kJ
O Macmillan Learning Given the reactions, X(s) + O₂(g) → XO(s) XCO3(s) → XO(s) + CO₂(g) -> what is AH for this reaction? AH = X(s) + O₂(g) + CO₂(g) – ->> → XCO3(s) -492.75 AH = -878.1 kJ Incorrect AH = +323.3 kJ
(100g)(4.184J/g K)(t-22)=(275g)(0.444J/g K)(t-100) What is the step by step solution to this problem?