The Enthalpy of Vaporization of Ammonia at Its Normal Boiling $\circ$

question 19

Multiple Choice

The enthalpy of vaporization of ammonia at its normal boiling point,-33.34 ^$\circ$ C,is approximately 23.35 kJ/mol.What is the entropy change in the surroundings when one mole of liquid ammonia vaporizes at -33.34 ^$\circ$ C in a large room maintained at a temperature of 25.0 ^$\circ$ C?

• A)-2.40 \(\times\) 10² J/K
• B)-78.3 J/K
• C)-19.1 J/K
• D)+78.3 J/K
• E)+2.40 \(\times\) 10² J/K

---

Definitions:

ANOVA

ANOVA, or Analysis of Variance, is a statistical method used to test differences between two or more means by analyzing variation within and between groups.

Means

Refers to the arithmetic average of a set of numbers, calculated as the sum of the numbers divided by the count of those numbers.

Null Hypothesis

A statistical hypothesis that assumes no significant difference or effect exists among the tested groups or variables.

Chi-Square Test

A statistical test used to determine if there is a significant difference between observed frequencies and expected frequencies in categorized datasets.