Phase Changes: a Substance Has a Melting Point of 20°C

question 34

Multiple Choice

Phase changes: A substance has a melting point of 20°C and a heat of fusion of 3.9 × J/kg. The boiling point is and the heat of vaporization is at a pressure of 1.0 atm. The specific heats for the solid, liquid, and gaseous phases are 600 J/(kg ∙ K) , 1000 J/(kg∙K) , and 400 J/(kg ∙ K) , respectively. The quantity of heat required to raise the temperature of of the substance from to at a pressure of 1.0 atm, is closest to

• A) 620 kJ.
• B) 470 kJ.
• C) 560 kJ.
• D) 210 kJ.
• E) 770 kJ.

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Definitions:

Units-Of-Production

A strategy for depreciation which assigns the cost of a property over its operational life, based on the volume of output it yields.

Double-Declining-Balance

An accelerated method of depreciation that doubles the regular depreciation rate, allowing for faster depreciation of assets in the early years.

Straight-Line

A method of calculating depreciation or amortization by dividing the difference between an asset's cost and its salvage value by the number of years it is expected to be used.

Depreciation Expense

The allocation of the cost of a tangible asset over its useful life, reflecting wear and tear, deterioration, or obsolescence.