Calculate the Amount (Mass) of Acetaldehyde (C₂H₄O, Molar Mass =

question 69

Multiple Choice

Calculate the amount (mass) of acetaldehyde (C₂H₄O, molar mass = 44.0526 g mol^-1) that causes a bomb calorimeter with a heat capacity of 12.91 kJ °C^-1 to have a temperature increase from 27.8 °C to 41.7 °C. The Δ_rU for the combustion of acetaldehyde is -1166.9 kJ mol^-1.

• A) 6.77 g
• B) 8.67 g
• C) 4.29 g
• D) 7.30 g
• E) 5.55 g

---

Definitions:

Cetaceans

A group of marine mammals that includes whales, dolphins, and porpoises, characterized by their fully aquatic lifestyle.

Nile Perch

A large freshwater fish native to African rivers, lakes, and reservoirs, known for its significant role in commercial fishing.

Lake Victoria

Africa's largest lake by area, and it is among the largest freshwater lakes in the world, known for its rich biodiversity.

Biodiversity Decline

A reduction in the variety and variability of life forms within a given ecosystem, region, or across the planet, often resulting from human activities.