Answer: Hsub=Hfus+Hvap
Explanation:
The molar heat of vaporization measured in kilojoules per mole, or kJ/mol is the energy needed to make vapor one mole of a liquid. .
The molar heat of sublimation measured in kilojoules per mole, or kJ/mol is the energy needed to sublime one mole of a solid,
the molar heat of fusion measured in kilojoules per mole, or kJ/mol is the energy needed to melt one mole of a solid.
Hess law helps to explain the relationship in physical chemistry stating that the total enthalpy change during the complete course of a reaction is the same whether the reaction is made in one step or in several steps.
In this context Hess’s law helps to see the several steps involved as the heat of sublimation energy is equal to the sum of vaporization energy and fusion energy.
Answer:
A.
Explanation:
A change of position over time.
B is a vector and C is a distance.
Radiation is the heat that travels directly to the earth
To find density we have to know the values of density and mass. Here mass is given which i 180g.
we know the formula to find the density is:
Density = Mass / volume
so the density will be 180 / volume = 180g per unit volume
if we know the volume, we can find exact value of density.
<h2>Answer:</h2>
Given data:
Volume of solution: 500 ml
Mass of 10 ml solution: 10.7 g
Density of whole solution: ?
<h3>Solution:</h3>
Mass of 500 ml solution : 10.7/10 * 500 = 535 g
Density = Mass/ volume
<u>Putting values in formula :</u>
D = 535/500 = 1.07 g/ml
Hence Density = 1.07 g/ml
