Calculate the Internal Energy Change, Δ_rU, for the Combustion of 6.9261

question 23

Multiple Choice

Calculate the internal energy change, Δ_rU, for the combustion of 6.9261 g of diethylene glycol (C₄H₁₀O₃, molar mass = 106.120 g mol^-1) if the combustion inside a bomb calorimeter, C_cal = 13.84 kJ °C^-1, causes a temperature change from 22.8 °C to 34.0 °C.

• A) -4.39 × 10³ kJ mol^-1
• B) -9.16 × 10² kJ mol^-1
• C) -2.37 × 10³ kJ mol^-1
• D) 4.39 × 10³ kJ mol^-1
• E) 1.18 × 10³ kJ mol^-1

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Definitions:

Salmon

A species of fish commonly found in the Atlantic and Pacific Oceans, often cultivated for food and known for its nutritional benefits.

Comparative Advantage

The capacity of a nation, person, firm, or area to create a product or offer a service at a reduced opportunity cost compared to that of its rivals.

Opportunity Cost

The potential benefit that is given up when choosing one alternative over another.

Comparative Advantage

The ability of a party to produce a particular good or service at a lower marginal cost than others.