Learning Goal: To calculate the total energy required to convert a solid to a gas using heat capacity, heat of fusion, and heat

Question

Learning Goal:
To calculate the total energy required to convert a
solid to a gas using heat capacity, heat of fusion,
and heat of vaporization.
The amount of heat required to melt one mole of a
solid is called the heat of fusion (AHfus). The
amount of heat required to vaporize (boil) one mole
of a liquid is called the heat of vaporization (
AHvap). The heat of fusion and the heat of
vaporization can be used to calculate the amount of
heat needed to melt or vaporize, respectively, a
given amount of substance.
For example, the heat of fusion for H₂O is
6.02 kJ/mol, which means that 6.02 kJ of heat is
needed to melt a mole of ice. Twice as much heat
is needed to melt twice as much ice, as shown
here:
2.00 mol x 6.02 kJ/mol = 12.0 kJ
How much heat is required to raise the temperature of 45.0 g of water from its melting point to its boiling point?
Express your answer numerically in kilojoules.
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18.8 kJ
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Correct answer is shown. Your answer 18.9 kJ was either rounded differently or used a different number of
significant figures than required for this part.
Part C
How much heat is required to boil 45.0 g of water at its boiling point?
Express your answer numerically in kilojoules.
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Kunduz · Accepted Answer

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