In an Experiment, 7

question 70

Multiple Choice

In an experiment, 7.5 g of liquid water at 35 is converted into steam with a temperature of 145C. How much energy is required for this process? _vap  2,260 J/g; H_fus  334 J/g; c_s(ice)  2.06 J/(g  ) ; c_s(water)  4.18 J/(g  ) ; c_s(steam)  1.99 J/(g  ) )

• A)2.04 kJ
• B)17.0 kJ
• C)19.7 kJ
• D)5.40 kJ
• E)125 kJ

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Definitions:

Short Run

A period in economics where at least one input is fixed and cannot be changed, limiting the ability to increase production.

Long Run

A period of time in economics wherein all inputs and factors of production can be varied, with no fixed factors.

Variable Inputs

Resources or factors of production that can be adjusted in the short run to meet changes in demand.

Diminishing Returns

An economic concept indicating that as more investment is made in a particular area, the rate of profit from that investment, after a certain point, starts to decline.