Chemistry: Hydrogen reacts with oxygen to form water:

2 × (H−H) + O=O → 2 × (H-O-H)

Use the bond energies in the table to calculate the energy change for this reaction.

Bond Bond energy
H−H 436 kJ mol-1
O=O 498 kJ mol-1
O-H 464 kJ mol-1

Question

Hydrogen reacts with oxygen to form water:

2 × (H−H) + O=O → 2 × (H-O-H)

Use the bond energies in the table to calculate the energy change for this reaction.

Bond	Bond energy
H−H	436 kJ mol-1
O=O	498 kJ mol-1
O-H	464 kJ mol-1

Miqdaam · Accepted Answer

Energy in = (2 x 436) + 498 = 1370 kJ mol -1
Energy out = 2 × 2 × 464 = 1856 kJ mol-1
Energy change = in - out = 1370 - 1856 = -486 kJ mol-1

Hydrogen reacts with oxygen to form water: 2 × (H−H) + O=O → 2 × (H-O-H) Use the bond energies in the table to calculate the energy change for this reaction. Bond Bond energy H−H 436 kJ mol-1 O=O 498 kJ mol-1 O-H 464 kJ mol-1