Answer:
Mass = 51.12 g
Explanation:
Given data:
Mass of lithium nitride = 32.9 g
Mass of water needed = ?
Solution:
Chemical equation:
Li₃N + 3H₂O → NH₃ + 3LiOH
Number of moles of lithium nitride:
Number of moles = mass/ molar mass
Number of moles = 32.9 g/ 34.83 g/mol
Number of moles = 0.945 mol
Now we will compare the moles of water and lithium nitride.
Li₃N : H₂O
1 : 3
0.945 : 3×0.945 = 2.84 mol
Mass of water:
Mass = number of moles × molar mass
Mass = 2.84 mol × 18 g/mol
Mass = 51.12 g
