?Ch, 7-Thermochemistry Question 1 10120 ? Constants I Periodic Table Part A You

Question

?Ch, 7-Thermochemistry Question 1 10120 ? Constants I Periodic Table Part A You may want to reference (Page) Section 7.1 while completing this problem. Calculate the quantity of heat, in kilojoules, required to raise the temperature of 9.50 L of water from 23.0 to 29.2 °C Express your answer using two significant figures. kJ Submit Part B Calculate the quantity of heat, in kilojoules, associated with a 32.0 °C decrease in temperature in a 5.95 kg aluminum bar (specific heat of aluminum 0.903Jg1°c Express your answer using three significant figures kJ Submit Reguest Answer

Explanation / Answer

A)

density of water is 1 Kg/L

So,

mass = density * volume

= 1 Kg/L * 9.50 L

= 9.50 Kg

specific heat capacity of water,

C = 4.184 KJ/Kg.oC

use:

Q = m*C*delta T

= (9.50 Kg)*(4.184 KJ/Kg.oC)*(29.2 - 23.0) oC

= 2.5*10^2 KJ

Answer: 2.5*10^2 KJ

B)

Q = m*C*delta T

= 5.95 Kg * 0.903 KJ/Kg.oC * (-32) oC

= -172 KJ

Answer: -172 KJ

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