When 1 mole of hydrogen gas (H2) reacts with excess oxygen to form water at a constant pressure, 241.8 KJ of energy is released as heat. Calculate ΔH for a process in which 21.9 g sample of hydrogen gas (H2) reacts with excess oxygen at constant pressure.

The value of ΔH when 21.9 grams of hydrogen gas reacts with an excess of oxygen gas is 2,647.71  kilo Joules.

Explanation:

Mass of hydrogen gas = 21.9 g

Moles of hydrogen gas =

When 1 mole of hydrogen gas reacts with an excess oxygen gas it gives 241.8 kJ of heat.

Then 10.95 moles hydrogen gas will give :

The value of ΔH when 21.9 grams of hydrogen gas reacts with an excess of oxygen gas is 2,647.71  kilo Joules.

intermolecular forces are the forces between molecules or particles.

there are two kinds of van der waals forces: weak london dispersion forces and stronger dipole-dipole forces.

in molecule of water there are dipole-dipole forces between negatively charged oxygen from one molecule of water and positively charger hydrogen of another molecule of water.

hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (h), covalently bound to a highly electronegative atom such as flourine (f), oxygen (o) and nitrogen (n) atoms.