Sapling Learning macmillan learning The figure below is a heat curve for an unkn

Question

Sapling Learning macmillan learning The figure below is a heat curve for an unknown outerspace substance discovered by the Mars rover. By understanding the heat curve, scientists can make inferences about the composition of the planet What is the temperature of fusion, Tfusion, and vaporization, Tvapor, for this unknown substance? Note that the units are graded Temperature (C) 400 380 360 Number Units 320 300 280 260 fusion 220 200 180 160 140 120 100 80 Number Units vapor For a sample of 89.8 g of this substance with a specific heat of 47.1 J/kg. °C, how much heat is added to the substance if the temperature is to change from 180.0°C to 256.0°C? 40 0 80 120 160 Number Time

Explanation / Answer

From the graph

Tfusion = 800 C

Tvapor = 2800 C

Q = mC(deltaT)

m= 89.8g = 0.0898kg

C= 47.1 J/kg0C

deltaT = 256-180 = 760 C

Q = 0.0898 * 47.1 * 76

= 321.448 J

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