Given: H₂O(l)  H₂O(g) H° = 40

question 1

Multiple Choice

Given: H₂O(l)  H₂O(g) H° = 40.7 kJ at 373K What is the entropy change in the system (S) when one mole of water vaporizes at 100 °C and a pressure of one atmosphere?

• A) 407 J/K
• B) -407 J/K
• C) 109 J/K
• D) -109 J/K
• E) J/K

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Definitions:

Null Hypothesis

In statistics, a statement suggesting that there is no significant effect or difference, and any observed deviation is due to random chance.

Chi-Squared Test

A statistical test used to determine if a significant relationship exists between two categorical variables by comparing observed and expected frequencies.

Contingency Table

A table used in statistics to summarize the distribution of two categorical variables, showing the frequency at which certain combinations of the variables occur.

Alternative Hypothesis

The hypothesis that there is a significant difference between groups or conditions, as opposed to the null hypothesis.