Respuesta :
The energy required to melt 20 g of water (ice) starting at 0° C is 6680 J.
What is Heat?
Heat is a form of energy that is possessed by a system by virtue of its temperature. Its unit is Joule.
Enthalpy is the amount of the heat content of a system.
What is Heat Capacity?
It is the amount of heat required to increase the temperature of a system by 1° C. It is an extensive property. Its unit is J/°C
Heat Capacity is given by
[tex]c= \frac{q}{\Delta T}[/tex]
where q = heat required
[tex]\Delta T[/tex] = change in temperature
Enthalpy of Fusion is the enthalpy change when 1 mole of a solid substance changes into its liquid state at its melting point.
Here, water in solid form (ice) melts into liquid form at 0°C
[tex]H_{2} O (s) \rightarrow H_{2} O(l) \\\Delta H_{fus } =334Jg^-^1[/tex]
We know,
[tex]\Delta H = \frac{m}{q}\\[/tex]
where m = given mass
q = heat required
[tex]q = \Delta H \times m[/tex]
q = 334 [tex]Jg^-^1[/tex] x 20 g
= 6680 J
Thus, the heat required to melt 20 g of water at 0°C is 6680 J
Learn more about Enthalpy:
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