Ch.17-18 HW Problem 17.111 Problem 17.111 Part A What is the latent heat of fusi
ID: 1796187 • Letter: C
Question
Ch.17-18 HW Problem 17.111 Problem 17.111 Part A What is the latent heat of fusion for this solid? As a physicist, you put heat into a 500.0 g solid sample at the rate of 10.0 k.J/min, while recording its temperature as a function of time. You plot your data and obtain the graph shown in the figure (Eigure 1) Express your answer using two significant figures. J/kg My Answers Give Up Part B What is the specific heats of the liquid? Express your answer using two significant figures. Fgure 1 of t 7() 40 ca J/(kg-K My Answers Give Up 20 Part C What is the specfic heats of the solid state of the material? Express your answer using two significant figures. o 1 23 4 0 888, 2 3 4Explanation / Answer
A)There happens a phase change between t = 1 to 3. So
Q = H (2.5 - 1) = m Lf
Lf = 10 x 10^3 x 1.5/0.5 = 3 x 10^4 J/kg
Hence, Lf = 3 x 10^4 J/kg
B)Heating ocuurs between t = 2.5 to 4
Q = m C delta T = H t
C = H t/ m delta T
C = 10 x 10^3 x (4 - 2.5)/0.5 x (40 - 10) = 10^3 J/kg
Hence, C = 10^3 J/kg-K
C)C = H t/m delta T
C = 10 x 10^3 x 1/(0.5 x (10 + 5)) = 1300 J/kg-K
Hence, C = 1300 = 1.3 x 10^3 J/kg-K