2019-09-11

## What is the standard enthalpy of formation of H2O2?

Selected ATcT enthalpy of formation based on version 1.118 of the Thermochemical Network

Species Name Formula ΔfH°(298.15 K)
Hydrogen peroxide H2O2 (cr,l) -187.341

## What is the bond enthalpy of H2O2?

Hydrogen peroxide, HOOH, has a very weak O-O bond and is photolyzed by light of 845 nm. Its bond energy is only about 142 kJ/mol.

## What is the standard state of H2O2?

liquid
Hydrogen peroxide is a colorless liquid at room temperature with a bitter taste.

## Why is SS bond stronger than OO bond?

due to small size the lone pair of electrons on oxygen atoms repel the bond pair of O-O bond to a greater extent than the lone pair of electrons on the sulfur atoms in S-S bond….as a result S-S bond (bond energy=213 kj/mole)is much more stronger than O-O(bond energy = 138 kj/mole) bond …

## Why is the OO bond so weak?

Oxygen has a small size that leads to smaller O-O bond length. Therefore, a lone pair of electrons on both the oxygen repel each other leading to weakening of O-O bond.

## What is the heat of formation of H2O?

The standard enthalpy of formation of H2O (l) at 25 °C is -285.8 kJ/mol.

## What is the equation for heat of formation?

Remember, the heat of formation of H + is zero. The equation becomes: ΔH = ΔHf Br -(aq) – ΔHf HBr(g) The values for ΔHf may be found in the Heats of Formation of Compounds of Ions table.

## What is the heat of formation of H2?

As per convention, specific heat of formation of all elements in their naturally existing state is considered as 0 kJ/kg at STP conditions. Since hydrogen exists as a diatomic molecule H2 in its natural state, Specific Heat of formation of H2 is 0 kJ/kg.

## What is the standard enthalpy of formation of water?

The standard enthalpy of formation for liquid water is -285.8 kJ / mole.