In a Steam Engine, Steam in a Cylinder Is Compressed

question 34

Multiple Choice

In a steam engine, steam in a cylinder is compressed by a piston exerting 16.5 atm of external pressure.The volume of the cylinder decreases by 22.4 L, and simultaneously the steam heats up.If the total energy change of the steam is 42.6 kJ, calculate the heat flow into/out of the steam. (101.3 J =1 L.atm)

• A)+80.0 kJ
• B)+37.4 kJ
• C)-37.4 kJ
• D)+5.2 kJ
• E)-5.2 kJ

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Definitions:

Median

The middle value in a data set when the values are arranged in ascending or descending order, or the average of two middle numbers if the dataset has an even number of observations.

Set of Data

A collection of related pieces of information or numerical values subject to analysis.

Mean

The central value of a numeric dataset, determined by summing all the numbers and dividing by the total number of values present.

Frequency Distribution

A statistical representation showing the number of occurrences of each distinct value in a set of data.