specific heat of mgo kj mol

practice exam 4 2007 key

(specific heat = 0 4494 J/gC) at 0C and the two blocks are insulated from the rest of the universe The final temperature of the two blocks a will be higher than 50C b will be lower than 50C c will be exactly 50C d is unrelated to the composition of the blocks e cannot be predicted 11 A 0 1326 g sample of magnesium was burned in an oxygen bomb calorimeter The total

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Chemistry 101 Experiment 7

Chemistry 101 Experiment 7 - ENTHALPY OF REACTION USING HESS'S LAW The standard enthalpy of formation of a compound H f o is the heat change accompanying the formation of one mole of compound from the elements at standard state The standard state of a substance is the most stable physical form of the compound at one atmosphere pressure and 25 C Elements in their standard

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thermo practice The answers are on the last page

thermo practice The answers are on the last page Multiple Choice Identify the letter of the choice that best completes the statement or answers the question ____ 1 Which of the following types of energy is not kinetic energy? a thermal energy b electrical energy c

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Magnesium oxide

−601 6 0 3 kJmol −1: Standard molar entropy S o 298: 26 95 0 15 Jmol −1 K −1: Specific heat capacity C: 37 2 J/mol K: Pharmacology ATC code A02AA02 A06AD02 A12CC10 Hazards Main hazards: Metal fume fever Irritant NFPA 704 : 0 1 0 R-phrases: R36 R37 R38: Flash point: Non-flammable U S Permissible exposure limit (PEL) TWA 15 mg/m 3 (fume) Related compounds Other

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(44) If the actual mass of MgO produced was 0 5 mol what

To then calculate the heat formation of MgO ΔHT the sum of all the reactions must be determined including ΔHC the heat formation of water which is already predetermined to be -285 8 kJ/mol However to determine the proper equation for ΔHT the stoichiometric equations must first be balanced:

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Enthalpy

The enthalpy of formation of propane is -104 kJ/mol Calculate the enthalpy of combustion of butane C 4 H 10 (g) for the formation of H 2 O(g) and CO 2 (g) The enthalpy of formation of butane is -126 kJ/mol Both propane and butane are used as gaseous fuels Which compound produces more heat

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What Is the Specific Heat Capacity of HCl?

The specific heat of hydrochloride at constant pressure is 21 4 joules per Kelvin mole according to Georgia State University However specific heat for gases is expressed in constant volume as well which means that the specific heat for HCl also is expressed as 2 57 molar heat

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1

Specific heat capacity is a) the quantity of heat needed to change the temperature of 1 00 g of a substance by 1 00 K Note: This is the same as changing the temperature by 1 oC 2 If 245 J is required to change the temperature of 14 4 g of chromium by 38 0 K what is the specific heat capacity of chromium? 245 specific heat = 0 448 / 14 4 38

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Chapter 9 Thermochemistry: Chemical Energy

Specific heat of water is given as 4 182 J/(C g) In elaborate experiments we can not use specific heat of water as the specific heat of surrounding since the wall might absorb some of the heat and it might change the value The specific heat of the calorimeter must be independently determined For us in this course we use the specific

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Heat of Combustion – Neutrium

The heat of combustion is the energy liberated when a substance undergoes complete combustion at constant pressure usually in an environment with excess Oxygen The heat of combustion is utilised to quantify the performance of a fuel in a combustion system such as furnaces power generation turbines and motors This article describes the heat of combustion and provides a list of heats of

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KM 554e

kJ/mol rxn Assuming that no heat was lost to the surroundings q q cal In trials 2 and 4 rxn -1 700 J I mol MgO 0 50 g 40 30 g Mgo I point is earned for the correct calculation of moles of MgO or setup of equation I point is earned for the value of AHO and sign consistent with the setup = -140 000 J/mol x rxn J 1000 J -140 kJ/mol rxn In trial 3 -880 J I mol MgO 0 25 g Mgo x 40 30 g Mgo

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Enthalpy (Heat of Reaction)

EXOTHERMIC REACTIONS- release energy and therefore ΔH is negative Heat is released by the system due to the reactants of the reaction having a greater enthalpy than the products The energy term will be included in the reaction on the product side CH 4(g) + 2O 2(g)-- CO 2(g) + 2H 2 O (l) ΔH=-890 4kJ can also be written as

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Heat of Combustion – Neutrium

The heat of combustion is the energy liberated when a substance undergoes complete combustion at constant pressure usually in an environment with excess Oxygen The heat of combustion is utilised to quantify the performance of a fuel in a combustion system such as furnaces power generation turbines and motors This article describes the heat of combustion and provides a list of heats of

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Ch 9 Exercises

Assuming the specific heat of the solution and products is 4 20 J/g C calculate the approximate amount of heat absorbed by the reaction which can be represented by the following equation: Ba(OH) 2 8H 2 O(s) + 2NH 4 SCN(aq) Ba(SCN) 2 (aq) + 2NH 3 (aq) + 10H 2 O(l) 28 The reaction of 50 mL of acid and 50 mL of base described in Example 9 5 increased the temperature of the solution by 6 9

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Thermochemistry and calorimetry

The quantitative study and measurement of heat and enthalpy changes is known as thermochemistry Because the specific heat capacity of water (4 184 J g –1 K –1) is known to high precision a measurement of its temperature rise due to the reaction enables one to calculate the quantity of heat released The calorimeter constant In all but the very simplest calorimeters some of the heat

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Thermochemistry and calorimetry

The quantitative study and measurement of heat and enthalpy changes is known as thermochemistry → H 2 O (g 373 K 1 atm) ΔH = 40 7 kJ mol –1 The quantity 40 7 is known as the enthalpy of vaporization (often referred to as "heat of vaporization") of liquid water Because the specific heat capacity of water (4 184 J g –1 K

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How to Calculate Enthalpies of Reaction

Molar Specific Heat Capacity = the amount of energy required to raise the temperature of 1 mole of material by 1 unit Calculation of Enthalpy of Reaction Example 1: Calculate the temperature change that results from adding 250 J of thermal energy to 0 50 moles of mercury

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The Enthalpy Change of a Chemical Reaction

The specific heat capacity ('solution') of the resulting MgCl 2 solution is 3 97 J/g oC 2 Use the calibrated values for the heat capacity of your calorimeter (92 9JoC) 3 Calculate the average heat released by the reaction and the ∆H0 for the reaction in kilojoules per mole of magnesium Your Lab Report Should Include the Following:

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10 A 2 80g piece ofmetal absorbs 10 0J of energy as it is heated from 22 00C to 35 00C Find the specific heat (in J/goK) of this metal DS 275 11 The heat released during the combustion of 250 g of propane (C3H8) was 950 kJ Calculate the molar enthalpy (in kJ/mol) change for the reaction 50 250)/

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Thermochemistry Worksheet #1

Thermochemistry Worksheet #1 1 The reaction of magnesium with sulfuric acid was carried out in a calorimeter This reaction caused the temperature of 27 0 grams of liquid water within the calorimeter to raise from 25 0 C to 76 0 C Calculate the energy associated with this reaction 2 The reaction of zinc with nitric acid was carried out in a calorimeter This reaction caused the

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Enthalpy of Formation of Magnesium Oxide

3) evolves 19 3 kJ of heat what is the standard enthalpy of formation for Mg 2+ (aq) expressed in kJ/mol? Introduction : The goal of this exercise is to measure the enthalpies of formation of Mg 2+ (aq) and MgO (s) The enthalpy of formation of Mg 2+ (aq) can

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