Ethanol (C₂H₅OH) Melts at - 114°C

question 80

Multiple Choice

Ethanol (C₂H₅OH) melts at - 114°C. The enthalpy of fusion is 5.02 kJ/mol. The specific heats of solid and liquid ethanol are 0.97 J/g- K and 2.3 J/g- K, respectively. How much heat (kJ) is needed to convert 25.0 g of solid ethanol at - 135°C to liquid ethanol at - 50°C?

• A) 207.3
• B) 9.21
• C) - 12.7
• D) 6.91
• E) 4192

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Definitions:

Book Value

The net value of an asset or a company, calculated by subtracting liabilities from assets, often used to assess if a stock is under or overvalued.

Residual Value

The projected worth of an asset upon reaching the end of its serviceable duration.

Straight-Line Depreciation

A method of allocating the cost of a tangible asset over its useful life in equal annual amounts, simplifying accounting processes.

Accumulated Depreciation

The total amount of a tangible asset's cost that has been expensed since the asset was put into use, often shown on the balance sheet as a reduction from the asset's historical cost.