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Yakvenalex [24]
3 years ago
14

What is the amount of heat required to change one mole of a substance from the solid to liquid state known as?

Chemistry
2 answers:
nika2105 [10]3 years ago
7 0
<h2>Answer:</h2>

A) the enthalpy of fusion

Explanation:

the heat of vaporization, is the amount of energy needed to change a liquid to a gas at constant temperature and pressure. The energy required to melt a solid to a liquid is called the <u><em>heat of fusion</em></u>,  and the heat of sublimation is the energy.

Alla [95]3 years ago
5 0

melting point because the melting point is the heat required to make an object melt anything less than this poitn will not make the substence melt.

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What is the mass in grams of 4.25 x 103moles of N2?
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Mass =?
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2 years ago
Calculate the molar solubility of CaF2 in a 0.25 m solution of NaF(aq).
Kipish [7]

Answer:

6.4 × 10^-10 M

Explanation:

The molar solubility of the ions in a compound can be calculated from the Ksp (solubility constant).

CaF2 will dissociate as follows:

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1 mole of Calcium ion (x)

2 moles of fluorine ion (2x)

NaF will also dissociate as follows:

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Where Na+ = 0.25M

F- = 0.25M

The total concentration of fluoride ion in the solution is (2x + 0.25M), however, due to common ion effect i.e. 2x<0.25, 2x can be neglected. This means that concentration of fluoride ion will be 0.25M

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Ksp = {x}{0.25}^2

4.0 × 10^-11 = 0.25^2 × x

4.0 × 10^-11 = 0.0625x

x = 4.0 × 10^-11 ÷ 6.25 × 10^-2

x = 4/6.25 × 10^ (-11+2)

x = 0.64 × 10^-9

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