A Substance Has a Melting Point of 20°C and a Heat

question 32

Multiple Choice

A substance has a melting point of 20°C and a heat of fusion of 3.4 × $10^4$ J/kg. The boiling point is $150 ^ { \circ } \mathrm { C }$ and the heat of vaporization is $6.8 \times 10^4 \mathrm {~J} / \mathrm { kg }$ at a pressure of one atmosphere. The specific heats for the solid, liquid, and gaseous phases are 600 J/kg ∙ K (solid) , 1000 J/kg ∙ K (liquid) , and 400 J/kg ∙ K (gaseous) . How much heat is required to raise the temperature of $1.90 \mathrm {~kg}$ of this substance from $- 4 ^ { \circ } \mathrm { C }$ to $106 ^ { \circ } \mathrm { C }$ at a pressure of one atmosphere?

• A) 260 kJ
• B) 190 kJ
• C) 230 kJ
• D) 92 kJ
• E) 320 kJ

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Definitions:

Demand

The quantity of a good or service that consumers are willing and able to purchase at various prices during a certain period of time.

CDs

Certificates of Deposit, savings certificates with a fixed maturity date and specified fixed interest rate, offering a low-risk investment option.

Quantity Demanded

Refers to the total amount of a good or service that consumers are willing and able to purchase at a given price in a specified time period.

Demand

Demand in economics is defined as consumers' willingness and ability to purchase goods or services at a given price over a specific period of time.