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?

about 142 kJ/mol
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.