# How many kilojoules are associated with the formation of 2 moles?

## How many kilojoules are associated with the formation of 2 moles?

You know that when 2 moles of hydrogen gas react with 1 mole of oxygen gas, you get 2 moles of water and 572 kJ of heat are evolved.

## What is the heat of formation of HBr?

-35.66
Selected ATcT enthalpy of formation based on version 1.122 of the Thermochemical Network

Species Name Formula ΔfH°(298.15 K)
Hydrogen bromide HBr (g) -35.66

Is kJ and kJ mol the same?

Usually it seems that delta H for an entire reaction is in kJ, since there are varying numbers of moles depending on which product or reactant it is. If the question asks for kJ per mole of product, then you would have to divide the enthalpy by the specific number of moles and give the answer in kJ/mole.

When 8 grams 4 moles of h2 react with 2 moles of o2 how many moles of water will be formed?

We have the 4 moles of oxygen but only 4 moles of hydrogen, instead of 8. So, the 4 moles of hydrogen reacts with 2 moles of oxygen, to give 4 moles of water.

### What is the bond energy of hydrogen bromide?

The energy change is positive, showing that energy is taken in from the surroundings in an endothermic reaction….Worked example – an endothermic reaction.

Bond Bond Energy (kJ/mol)
H−Br 366
H−H 436
Br−Br 193

### What will be the enthalpy change for the following reaction H2 Br2 2hbr?

Products = [B.E. H2 + B.E. Br2 ] – 2 B.E. HBr = 435 + 192 – 2 × 364 = – 101 kJ.

How many joules are in a mole?

It is also a SI derived unit of molar thermodynamic energy defined as the energy equal to one joule in one mole of substance. Since 1 mole = 6.02214076×1023 particles (atoms, molecules, ions etc.), 1 joule per mole is equal to 1 joule divided by 6.02214076×1023 particles, 1.66054×10−24 joule per particle.

When 4 moles H2 react what the mole of H2O?

So, the 4 moles of hydrogen reacts with 2 moles of oxygen, to give 4 moles of water.

## When 8 g of H2 react with 2 moles of o2 how many moles of water will be formed?

4 moles
So for every mole of H2 you will form a mole of water, assuming you have sufficient oxygen to react with it all. The atomic weight of hydrogen atoms is 1, but the molar mass of diatomic H2 is 2 g/mol. Therefore, 8 g of H2 is 4 moles. Therefore you will form 4 moles of water.

## What kind of chemical bond does hydrogen bromide HBr contain?

hydrogen bromide (CHEBI:47266) A diatomic molecule containing covalently bonded hydrogen and bromine atoms.

What will be the enthalpy of formation of HBr if hypothetical?

Answer: The ΔH for the reaction is – 100 KJ/mol.