27 Answered Questions for the topic Thermochemistry

Thermochemistry Chemistry

03/10/21

Calculate the enthalpy change for the reaction: C6H4(OH)2(aq) + H2O2(aq) <—>C6H4O2(aq) + 2H2O(l)?

Calculate the enthalpy change for the reaction: C6H4(OH)2(aq) + H2O2(aq) <—> C6H4O2(aq) + 2H2O(l)given the following data:C6H4(OH)2(aq)-->C6H4O2(aq)+H2(g)  H= +174.4 kJH2O(g)-->H2O(l)... more
Thermochemistry Chemistry

03/10/21

For the reaction: 2H2(g) + O2(g) <—> 2H2O(g) H = -296 kJ

a) How much heat is evolved when 150 g of hydrogen is burned in excess oxygen? b) How much heat is evolved when 125 g of water is produced? c) How much heat is evolved when 5 g of hydrogen reacts... more

03/05/21

When 28.2 mL of 0.500 M H2SO4 is added to 28.2 mL of 1.00 M KOH in a coffee-cup calorimeter at 23.50°C, the temperature rises to 30.17°C. Calculate ΔH of this reaction...

(Assume that the total volume is the sum of the individual volumes and that the density and specific heat capacity of the solution are the same as for pure water.) (d for water = 1.00 g/mL; c for... more

03/03/21

Oxidation of gaseous ClF by F2 yields liquid ClF3, an important fluorinating agent. Use the following thermochemical equations to calculate...

ΔH0rnx for the production of CIF3:(1) 2 CIF(g) + O2(g) ---> Cl2O(g) + OF2(g) ΔH0 = 167. 5 kJ(2) 2 F2(g) + O2(g) ---> 2 OF2(g) ΔH0 = -43.5 kJ(3) 2 CIF3(l) + 2 O2(g) ---> Cl2O(g) + 3... more

03/02/21

When 1 mol of CS2(l) forms from its elements at 1 atm and 25°C, 89.7 kJ is absorbed, and it takes 27.7 kJ to vaporize 1 mol of the liquid. How much heat is absorbed when 1 mol of CS2(g) forms from...

its elements at these conditions? Do not answer in scientific notation.I got 1174 kJ but it is wrong.

03/02/21

This one I am stuck....High-purity benzoic acid (C6H5COOH; ΔHrxn for combustion = −3227 kJ/mol) is used as a standard for calibrating bomb calorimeters. A 1.221-g sample burns in a calorimeter...

(heat capacity = 1365 J/°C) that contains exactly 1.370 kg of water. What temperature change is observed?My steps:-qreaction = - (1.221g HBZ) X 1 mol HBZ over 1221.2g HBZ X -3227 kJ over 1 mol HBZ... more

03/02/21

Copper(I) oxide can be oxidized to copper(II) oxide: Cu2O(s) + 1/2 O2(g) → 2 CuO(s).....

ΔH0rxn = -146.0 kJGiven ΔH0f of Cu2O(s) = −168.6 kJ/mol, find ΔH0f of CuO(s)

03/02/21

Sucrose (C12H22O11, table sugar) is oxidized in the body by O2 via a complex set of reactions that ultimately produces CO2(g) and H2O(l) and releases 5.16 × 103 kJ of heat per mole of sucrose...

(a) Write a balanced thermochemical equation for this reaction. Include the physical state of each reactant and product.Enter your answer for ΔHrxn in scientific notation.(b) Calculate the energy... more

03/02/21

I am pretty sure I did this completely wrong. When 25.8 mL of 0.500 M H2SO4 is added to 25.8 mL of 1.00 M KOH in a coffee-cup calorimeter at 23.50°C, the temperature rises to 30.17°C. Calculate ΔH...

of this reaction. (Assume that the total volume is the sum of the individual volumes and that the density and specific heat capacity of the solution are the same as for pure water.) (d for water =... more

03/02/21

When 20.1 mL of 0.500 M H2SO4 is added to 20.1 mL of 1.00 M KOH in a coffee-cup calorimeter at 23.50°C, the temperature rises to 30.17°C. Calculate ΔH of this reaction. (Assume...

that the total volume is the sum of the individual volumes and that the density and specific heat capacity of the solution are the same as for pure water.) (d for water = 1.00 g/mL; c for water =... more
Thermochemistry Math Science Chemistry

02/19/21

100.0 mL of 3.0 M HCl can be neutralized with exactly 200.0 mL of 1.5 M NaOH. If this reaction is done in a coffee cup calorimeter, what temperature change would you expect to observe?

100.0 mL of 3.0 M HCl can be neutralized with exactly 200.0 mL of 1.5 M NaOH. If this reaction is done in a coffee cup calorimeter, what temperature change would you expect to observe?
Thermochemistry Chemistry

11/16/20

Thermochemistry/Chemistry

Enthalpy of reaction for the combustion:    C(s) + O2(g) ⟶ CO2(g)                           ΔH1 = -395.5 kJ        CO(g) + O2(g) ⟶ CO2(g)                     ΔH2 = -285.0 kJ Using these date,... more

10/05/20

URGENT!!! What can the chemist report for the specific heat capacity of the substance?

A chemist carefully measures the amount of heat needed to raise the temperature of a 697.0g sample of a pure substance from 59.9°C to 67.2°C. The experiment shows that 21.kJ of heat are needed.... more

07/04/20

Thermochemistry Problem

When 125 mL of 0.220 M NaCl(aq) and 125 mL of 0.220 M AgNO3(aq), both at 21.6°C, are mixed in a coffee cup calorimeter, the temperature of the mixture increases to 24.3°C as solid AgCl... more
Thermochemistry Chemistry

04/11/20

thermochemistry

A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant... more

04/01/20

Bomb Calorimeter Question

When 6.10 g of urea, (NH2 )2 CO(s) , burns to produce CO2(g) , N2(g) , and H2O(l) ,67.8 kJ of heat energy are released in a bomb calorimeter. What is the energy released in the burning of one mole... more

03/12/20

Hess's Law, enthalpy,entropy,Gibbs free energy change Problem.

For the following unbalanaced reaction at 25°CPbCO3(s)-->PbO(s)+CO2(g)Calculate the standard enthalpy change, change in H° for the reactionCcalculate the standard entropy change, change in S°... more
Thermochemistry Chemistry

02/18/20

What is the relation between Molar enthalpy and Change in enthalpy? How do we use them together?

If I calculate Q=mc(delta t) as Q= (54.25 g)(4.19 J/g C)( 6 C) and get 1363.845 J. How do I convert this into change in enthalpy and molar enthalpy? This was done for a Calorimetry... more
Thermochemistry Chemistry

01/30/19

Calculating Work in Chemistry

I cannot understand these math concepts, and it would be great if someone could help me understand them!A piston containing 1.5 L of gas at 1.00 atm is compressed to 1.25 L. Calculate the value for... more

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