Given H₂(g)+ (1/2)O₂(g) $\rarr$ H₂O(l) $\Delta$ H° = -286 KJ/mol, Determine the Standard Enthalpy Change for Determine

question 67

Multiple Choice

Given H₂(g) + (1/2) O₂(g) $\rarr$ H₂O(l) , $\Delta$ H° = -286 kJ/mol, determine the standard enthalpy change for the reaction
2H₂O(l) $\rarr$ 2H₂(g) + O₂(g) .

• A)(\(\Delta\)H° = -286 kJ/mol)
• B)(\(\Delta\)H° = +286 kJ/mol)
• C)(\(\Delta\)H° = -572 kJ/mol)
• D)(\(\Delta\)H° = +572 kJ/mol)
• E)(\(\Delta\)H° = -143 kJ/mol)

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Definitions:

Rule of 5

A guideline in statistics that suggests if the sample size is smaller than 5, certain statistical methods, such as normal approximation, may not be reliable.

Expected Values

The mean of a probability distribution, representing the average outcome one can expect to see.

Null Hypothesis

A statement used in statistics that suggests there is no significant difference or effect, serving as the default assumption to be tested.

Chi-Squared Test

A statistical test used to determine whether there is a significant difference between the expected frequencies and the observed frequencies in one or more categories.