Question

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 1.00x10^{2} kJ of heat?

**Provide your
answer: numberE^n, remember to watch for sig. figs.**

Answer #1

Given :

Lattice energy of Potassium nitrate is -163.8 kCal/mol

Heat of hydration = -155.5 kcal /mol

Heat absorption = 1.00 E2 kJ

Heat of solution = Lattice energy + heat of hydration.

= -163.8 kcal/mol + (-155.5 kcal/mol)

=-319.3 kcal/mol

Lets convert kcal /mol to kJ/mol

1 kcal = 4.184 kJ

Heat of solution in kJ/mol

=(-319.3 kcal /mol ) * ( 4.184 kJ/kcal )

= -1335.9

= -1336. kJ/mol

Now for to dissolve 1 mol potassium nitrate there needs 1336 kJ heat

Now heat absorbed = 1.00 E 2 KJ

Amount of potassium nitrate required to absorb 1.00 E 2 kJ heat

= 1.00 E 2 kJ * 1 mol / 1336. kJ

= 0.075 mol potassium nitrate

Lets convert moles of potassium nitrate to mass

= 0.075 mol * molar mass

Molar mass of potassium nitrate = 101.1032 g/mol

Mass of potassium nitrate in g = 0.075 mol * 101.1032 g/mol

= 7.57 X 10^{0} g potassium nitrate.

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

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?

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.

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
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71.
If a gas furnace releases 450 kcal of heat energy, what is the
energy in kilojoules? 11 cal = 4.184 J
For determining the significance digits for answer do we
determine the given value to determine how Many sig figs are for
the answer
Or
Do we determine all parts of the equation, such as, the
conversions or
Can someone please go in depth

The standard-state free energy change in oxidizing NADH with
oxygen is -220 kJ/mol (-52.6 kcal/mol). If we accept this value as
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