A 356 G Sample of Ethanol (C₂H₅OH)is Burned in a Bomb

question 89

Multiple Choice

A 35.6 g sample of ethanol (C₂H₅OH) is burned in a bomb calorimeter according to the following reaction. If the temperature rose from 35.0 °C to 76.0°C and the heat capacity of the calorimeter is 23.3 kJ °C^-1, what is the value of Δ_rU°? The molar mass of ethanol is 46.07 g mol^-1. C₂H₅OH(l) + 3O₂(g) → 2CO₂(g) + 3H₂O(g) Δ_rU° = ?

• A)-1.24 × 10³ kJ mol^-1
• B)+1.24 × 10³ kJ mol^-1
• C)-8.09 × 10³ kJ mol^-1
• D)-9.55 × 10³ kJ mol^-1
• E)+9.55 × 10³ kJ mol^-1

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Definitions:

Surplus

The situation in which the quantity of a good supplied is greater than the quantity demanded at the current price.

Price Ceiling

A legally imposed maximum price on goods or services, intended to prevent prices from rising too high.

Equilibrium Price

The market price where the quantity of goods supplied is equal to the quantity of goods demanded.

Price Ceiling

A legal maximum price that can be charged for a good or service, above which it cannot be sold.