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What is the amount of energy involved in each of the
Chapter 2, Problem 35QP(choose chapter or problem)
What is the amount of energy involved in each of the following?a. calories to heat 25 g of water from 15 °C to 25 °Cb. joules to heat 15 g of water from 22 °C to 75 °Cc. kilocalories to heat 150 g of water in a kettle from 15 °C to 77 C
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QUESTION:
What is the amount of energy involved in each of the following?a. calories to heat 25 g of water from 15 °C to 25 °Cb. joules to heat 15 g of water from 22 °C to 75 °Cc. kilocalories to heat 150 g of water in a kettle from 15 °C to 77 C
ANSWER:Solution 35QPStep 1 of 3:The goal of the problem is to calculate the amount of energy involved in given conditions.We know, the formula to calculate specific heat: Specific heat = This can be rewritten to calculate heat energy as: Heat = mass Tspecific heata. Given:Mass of water = 25 g.Initial temperature (Ti ) = 15 °CFinal temperature (Tf ) = 25 °CEnergy in calories =First, let’s calculate T: T = Final temperature (Tf) - Initial temperature (Ti ) = 25 °C - 15 °C = 10 °CNow, let’s calculate the heat energy:Specific heat of water = 4.184 J/g °CTherefore, the heat energy will be: = 25 g 10 °C 4.184 J/g °C = 1.04103 JNow, let’s convert energy in joules to calories: 1 cal = 4.184 JSo, the conversion factor is = 1.04103 J = 248.56 cal.________________