What Is the Change in Internal Energy of the System

question 45

Multiple Choice

What is the change in internal energy of the system (ΔU) if 65 kJ of heat energy is evolved by the system and 62 kJ of work is done on the system for a certain process?

• A) -3 kJ
• B) -127 kJ
• C) -65 kJ
• D) 3 kJ
• E) 127 kJ

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Definitions:

Dimensional Analysis

The technique of applying conversion factors to express quantities in different units, often used in physics and engineering contexts.

Arithmetic

The branch of mathematics dealing with the properties and manipulation of numbers, including addition, subtraction, multiplication, and division.

Ounces

A unit of weight in the avoirdupois system equal to 1/16th of a pound or approximately 28.35 grams.

Quarts

A unit of liquid volume in the US customary system, equal to two pints, or about 0.946 liters.