How Much Energy (Heat) Is Required to Convert 25 $\circ$ C to H₂O(g) at 115

question 125

Multiple Choice

How much energy (heat) is required to convert 25.5 g of H₂O(l) at 35.0 ^$\circ$ C to H₂O(g) at 115.0 ^$\circ$ C

specific heat of ice: $\quad 2.09 \mathrm{~J} / \mathrm{g} \cdot{ }^{\circ} \mathrm{C} \quad \Delta \mathrm{H}_{\mathrm{fus}}=6.02 \mathrm{~kJ} / \mathrm{mol}$
specific heat of water: $4.18 \mathrm{~J} / \mathrm{g}{ \cdot}^{\circ} \mathrm{C} \quad \Delta \mathrm{H}_{\mathrm{vap}}=40.7 \mathrm{~kJ} / \mathrm{mo}$ .
specific hast of steam: $1.84 \mathrm{~J} / \mathrm{g} \cdot{ }^{\circ} \mathrm{C}$

• A) 207 J
• B) 7,630 J
• C) 8,530 J
• D) 9,130 J
• E) 65,200 J

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Definitions:

Puzzle Boxes

Experimental devices used in animal learning research, where an animal must solve a problem or manipulate mechanisms to escape or obtain a reward.

Thorndike

An American psychologist who developed the law of effect, which states that behaviors followed by positive outcomes are likely to be repeated, while those followed by negative outcomes are not.

Skinner Box

An experimental apparatus developed by B.F. Skinner for studying behavioral conditioning in animals, particularly through the use of reinforcements.

Operant Conditioning

A learning process through which the strength of a behavior is modified by reinforcement or punishment, a concept introduced by B.F. Skinner.