Sodium nitrate has a lattice energy of -2.48 x 10^2 kJ/mol, and a heat of hydration of -234 kJ/mol.
Determine how much heat is evolved or absorbed when 16.5 g of sodium nitrate completely dissolves in water?
hydration > lattice enery . so heat will be absorbed
heat of solution = hydration energy. - lattice energy
heat of solution = -234 + 248
= 14 kJ / mol
moles of NaNO3 = 16.5 / 85 = 0.194
heat absorbed = 14 kJ / mol x 0.194 mol
= 2.72 kJ
heat absorbed = 2.72 kJ
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