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alissa2151
20.11.2019 •
Chemistry
Heat is added to a 200.-gram sample of h2o(s) to melt the sample at 0°c. then the resulting h2o ( ) is heated to a final temperature of 65°c. determine the total amount of heat required to completely melt the sample.heat is added to a 200.-gram sample of h2o(s) to melt the sample at 0°c. then the resulting h2o ( ) is heated to a final temperature of 65°c. determine the total amount of heat required to completely melt the sample.
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Ответ:
Further explanation:
Heat of fusion is the amount of energy needed to melt a solid at its melting point. It is represented by
.
Step 1: The ice at
is converted to water at
.
The formula to calculate the amount of energy is as follows:
Here,
Q is the amount of heat required.
n is the number of moles of water.
The formula to calculate the moles of water is as follows:
Substitute 200 g for the given mass of water and 18 g/mol for the molar mass of water in equation (2).
Substitute 11.11 mol for n and 6.01 kJ/mol for
in equation (1).
Step 2: The temperature of water is raised from
to
.
The formula to calculate the heat energy of steam is as follows:
Here,
Q is the amount of heat transferred.
m is the mass of substance.
c is the specific heat of substance.
The temperature change for the above change can be calculated as follows:
Substitute 200 g for m,
for
and
for c in equation (3).
This energy is to be converted into kJ. The conversion factor for this is,
Therefore the energy can be calculated as follows:
The total amount of energy can be calculated as follows:
Here, Q is the total energy and
,and
are the values of energies calculated in first and second step respectively.
Substitute 66.77 kJ for
and 54.418 kJ for
in equation (4).
Learn more:
What is the enthalpy of the given reaction? Find the enthalpy of decomposition of 1 mole of MgO:Answer details:
Grade: Senior School
Chapter: Thermodynamics
Subject: Chemistry
Keywords: energy, Q1, Q2, Q, 54.418 kJ, 66.77 kJ, 121.88 kJ, m, c, temperature change, amount of heat, total energy.
Ответ: