# How do you calculate enthalpy in kJ mol?

## How do you calculate enthalpy in kJ mol?

and the standard enthalpy of formation values: ΔHfo[A] = 433 KJ/mol. ΔHfo[B] = -256 KJ/mol. ΔHfo[C] = 523 KJ/mol….Introduction.

Compound ΔHfo
CO(g) -110.5 kJ/mol
CO2(g) -393.5 kJ/mol
H2(g) 0 kJ/mol
H2O(g) -241.8 kJ/mol

Is enthalpy of formation in kJ mol?

and the standard enthalpy of formation values: ΔH fo[A] = 433 KJ/mol. ΔH fo[B] = -256 KJ/mol. ΔH fo[C] = 523 KJ/mol….Introduction.

Compound ΔHfo
CO2(g) -393.5 kJ/mol
H2(g) 0 kJ/mol
H2O(g) -241.8 kJ/mol
HF(g) -271.1 kJ/mol

How do you calculate the enthalpy of a mole?

Calculation of Molar Enthalpy of Solution (molar heat of solution) (6)

1. heat released or absorbed = mass × specific heat capacity × change in temperature.
2. moles = mass ÷ molar mass.
3. molar mass = molar mass of solute in grams per mole.

### How do you calculate wavelength from kJ mol?

A slightly different way would be to use Eλ = hc (with the wavelength in meters) and solve for E, then multiply the answer times Avogadro’s Number. Finally, divide by 1000 to get kJ/mol.

Why are bond enthalpy Reactus minus?

ΔH of a reaction in terms of bond enthalpies = Σ bond enthalpies (products) – Σ bond enthalpies (reactants). Therefore if the products are at a lower energy than the reactants, the reaction would be exothermic therefore ΔH would be negative.

What is the ΔfH value for CH4 G in kJ mol?

–74.8 kJ mol–1
The standard enthalpy of formation (ΔfH°) at 298 K for methane, CH4(g), is –74.8 kJ mol–1.

#### What is the ΔfH value for CH4 g in kJ mol?

What is the ΔfH value for h2o L in kJ mol?

-285.8
Table of Heats of Formation

Compound ΔHf (kJ/mol)
H2O(l) -285.8
H2O2(l) -187.6
H2S(g) -20.1
H2SO4(l) -811.3

What is a standard enthalpy of formation?

A standard enthalpy of formation is an enthalpy change for a reaction in which exactly 1 mole of a pure substance is formed from free elements in their most stable states under standard state conditions.

## How do you calculate the total enthalpy of formation of reactants?

This is done by subtracting the sum of the standard enthalpies of formation of the reactants from the sum of the standard enthalpies of formation of the products, as shown in the equation below. The standard enthalpy of formation is equivalent to the sum of many separate processes included in the Born-Haber cycle of synthesis reactions.

What is the enthalpy of formation for 2 mol of O3?

Thus, for O 3 ( g) is the enthalpy change for the reaction: For the formation of 2 mol of O 3 ( g ), ΔH°=+286 kJ/mol. This ratio, , can be used as a conversion factor to find the heat produced when 1 mole of O 3 ( g) is formed, which is the enthalpy of formation for O 3 ( g ):

What is the enthalpy of formation of CO2?

The standard enthalpy of formation of CO 2 ( g) is −393.5 kJ/mol. This is the enthalpy change for the exothermic reaction: starting with the reactants at a pressure of 1 atm and 25 °C (with the carbon present as graphite, the most stable form of carbon under these conditions) and ending with one mole of CO 2, also at 1 atm and 25 °C.

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