Given That Molar Enthalpy of Combustion of Acetylene (C₂H₂, 26 $\degree$

question 198

Multiple Choice

Given that molar enthalpy of combustion of acetylene (C₂H₂, 26.04 g/mol) is -1299 kJ/mol at 25 $\degree$ C and 1 atm, which statement below is FALSE? $\mathrm{C}_{2} \mathrm{H}_{2}(g) +\frac{5}{2} \mathrm{O}_{2}(g) \rightarrow 2 \mathrm{CO}_{2}(g) +\mathrm{H}_{2} \mathrm{O}(\ell)$

• A)The enthalpy of the reactants is lower than that of the products.
• B)The amount of heat released is proportional to the amounts of reactants.
• C)When 104 g C₂H₂ combusts, about 5200 kJ of heat is released.
• D)The enthalpy of combustion per gram acetylene is-49.9 kJ/g.
• E)To form 2 mol C₂H₂ and 5 mol O₂ from 4 mol CO₂ and 2 mol H₂O, 2598 kJ of energy is required.

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Definitions:

Chi-squared Goodness-of-fit

Chi-squared Goodness-of-fit tests how well observed data matches the expected data distribution in categories.

Two Categories

A classification into two distinct groups or divisions based on specific criteria.

Chi-squared Test

An analytical procedure utilized to check for a significant connection between two variables that are categorized.

Categories

Distinct groups or classifications into which data or objects can be organized.