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**

Sodium hydroxide (NaOH) has a lattice energy of -887 kJ/mol and
a heat of hydration of -932 kJ/mol. How much solution could be
heated to boiling by the heat evolved by the dissolution of 28.0 g
of NaOH? (For the solution, assume a heat capacity of 4.0 J/g⋅∘C,
an initial temperature of 25.0 ∘C, a boiling point of 100.0 ∘C, and
a density of 1.05 g/mL.)

Potassium nitrate has a lattice energy of -163.8 kcal/mol and a
heat of hydration of -155.5 kcal/mol. How much potassium
nitrate (in kg) has to dissolve in water to absorb 100 kJ of
heat?

Potassium nitrate has a lattice energy of -163.8 kcal/mol and a
heat of hydration of -155.5 kcal/mol. How much potassium nitrate
has to dissolve in water to absorb 102 kJ of heat? There are 4.184
kJ/kcal. Also note the answer is to be reported in kg.

Potassium nitrate has a lattice energy of -163.8 kcal/mol and a
heat of hydration of -155.5 kcal/mol.
Question:
How much potassium nitrate has to dissolve in water to absorb
109 kJ of heat? There are 4.184 kJ/kcal. Also note the answer is to
be reported in kg.

Potassium nitrate has a lattice energy of -163.8 kcal/mol and a
heat of hydration of -155.5 kcal/mol
1.How much potassium nitrate has to dissolve in water to absorb
107 kJ of heat? There are 4.184 kJ/kcal. Also note the answer is to
be reported in kg.

Potassium nitrate has a lattice energy of -163.8
kcal/mol and a heat of hydration of -155.5 kcal/mol.
How much potassium nitrate has to dissolve in water to absorb
104 kJ of heat?
Express your answer using two significant figures.
Answer in kg

Potassium nitrate has
a lattice energy of -163.8 kcal/mol and a heat of hydration of
-155.5 kcal/mol. How much potassium nitrate has to dissolve in
water to absorb 1.00x102 kJ of heat?
Provide your
answer: numberE^n, remember to watch for sig. figs.

Potassium perchlorate (KClO4) has a lattice energy of -599
kJ/mol and a heat of hydration of -548 kJ/mol.
A) Find the heat of solution for potassium perchlorate when 10.2
g of potassium perchlorate is dissolved with enough water to make
118.5 mLof solution.

Lattice energy for LiF(s) = -1047 kJ/mol
Enthalpy of hydration for Li+(g) = -536 kJ/mol
Enthalpy of hydration for F–(g) = -502 kJ/mol
Determine the enthalpy of solution for LiF(s), using the data
provided.

Sodium chloride has a lattice energy of - 787 kJ/mol.
Computational analysis of a hypothetical salt XY indicates that
X^3+ has the same radius as the sodium ion and Y^3- has the same
radius as the chloride ion. Estimate the lattice energy of XY.

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