   Chapter 20, Problem 27PS

Chapter
Section
Textbook Problem

A parking lot in Los Angeles receives an average of 2.6 × 107 J/m3 of solar energy per day in the summer. (a) If the parking lot is 325 m long and 50.0 m wide, what is the total quantity of energy striking the area per day? (b) What mass of coal would have to be burned to supply the quantity of energy calculated in (a)? (Assume the enthalpy of combustion of coal is 33 kJ/g.)

(a)

Interpretation Introduction

Interpretation: The total quantity of solar energy striking the area per day has to be calculated.

Concept introduction:

Area can be calculated by,

Area=length×width

Enthalpy of combustion: Enthalpy change when one mole of compound is burnt completely in presence of oxygen.

Explanation

Given:

Averagesolarenergyrecievesperday=2.6×107J/m2Lengthofparkinglot=325mlongWidthofparkinglot=50mwide

Area=length×width

Substituting the values

Totalareaof

(b)

Interpretation Introduction

Interpretation: The mass of coal required to produce the total quantity of solar energy striking the area per day much energy has to be given.

Concept introduction:

Enthalpy of combustion: Enthalpy change when one mole of compound is burnt completely in presence of oxygen.

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