Answer:
16.23 kj
Explanation:
Given data:
Mass of calcium hydroxide formed = 18.5 g
Molar mass of calcium hydroxide = 74.09 g/mol
Energy released = ?
Solution:
Chemical equation:
CaO + H₂O → Ca(OH)₂ + 65.2 Kj
Number of moles of Ca(OH)₂:
Number of moles = mass/ molar mass
Number of moles = 18.5 g/ 74.09 g/mol
Number of moles = 0.249 mol
when one mole of Ca(OH)₂ formed 65.2 Kj energy is released.
When 0.249 moles formed energy released is,
0.249 × 65.2 kj = 16.23 kj
