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What does the symbol (–hfus) indicate in a phase change?

Witch two conditions can limit the usefulness of the kinetic molecular theory in describing gas behavior?

What is the temperature in kelvin of a gas if it is allowed to expand from 1.50 l to 4.50 l? the initial temperature is 10.0°c and pressure is constant throughout the change. which equation should you use? t2= v2/v1 t1 what is the final temperature? ⇒ 849 k these are the answers.