Question

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?

Answer #1

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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