Given the Following Data $\Delta$ H_f,S°,respectively)for N₂O₄(l)-20

question 55

Multiple Choice

Given the following data ( $\Delta$ H_f,S°,respectively) for N₂O₄(l) -20.kJ/mol,209.0 J/K mol,and N₂O₄(g) 10.kJ/mol,304.2 J/K mol.Above what temperature (in °C) is the vaporization of N₂O₄ liquid spontaneous?

• A)Above -178 °C.
• B)Above -231 °C.
• C)Above 3 °C.
• D)Above 30. °C.
• E)Above 42 °C.

---

Definitions:

Straight-Line Method

A method of calculating depreciation or amortization by evenly dividing the asset’s cost over its useful life.

Salvage Value

The estimated residual value of an asset at the end of its useful life, expected to be recovered after its use is completed.

Monthly Depreciation

The portion of an asset’s cost that is expensed each month over its useful life.

Old Plant Asset

An asset that has been in use for a considerable period and is often nearing the end of its useful life.